319 lines
17 KiB
JSON
319 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-82750",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-08-31T01:00:09.774Z",
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"datePublished": "2026-09-06T16:08:41.089Z",
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"dateUpdated": "2026-09-08T18:25:42.388Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MPP.Methods.Tempo.FeePayerPolicy'",
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"'Elixir.MPP.Methods.Tempo'"
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],
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"packageName": "mpp",
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"packageURL": "pkg:hex/mpp",
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"product": "mpp",
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"programFiles": [
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"lib/mpp/methods/tempo/fee_payer_policy.ex",
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"lib/mpp/methods/tempo.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.MPP.Methods.Tempo.FeePayerPolicy':measure/3"
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},
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{
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"name": "'Elixir.MPP.Methods.Tempo.FeePayerPolicy':validate/3"
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},
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{
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"name": "'Elixir.MPP.Methods.Tempo':verify/2"
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}
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],
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"repo": "https://github.com/ZenHive/mpp",
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"vendor": "ZenHive",
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"versions": [
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{
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"lessThan": "0.16.1",
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"status": "affected",
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"version": "0.2.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MPP.Methods.Tempo.FeePayerPolicy'",
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"'Elixir.MPP.Methods.Tempo'"
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],
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"packageName": "zenhive/mpp",
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"packageURL": "pkg:github/zenhive/mpp",
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"product": "mpp",
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"programFiles": [
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"lib/mpp/methods/tempo/fee_payer_policy.ex",
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"lib/mpp/methods/tempo.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.MPP.Methods.Tempo.FeePayerPolicy':measure/3"
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},
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{
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"name": "'Elixir.MPP.Methods.Tempo.FeePayerPolicy':validate/3"
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},
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{
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"name": "'Elixir.MPP.Methods.Tempo':verify/2"
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}
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],
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"repo": "https://github.com/ZenHive/mpp",
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"vendor": "ZenHive",
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"versions": [
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{
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"lessThan": "0482572b47e1ffe1537ab80ab613d47b92833c2d",
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"status": "affected",
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"version": "d29d54e507918db00a5b65d90136b73166c017d7",
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"versionType": "git"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Only deployments that enable Tempo server-side fee sponsorship are affected, through <code>\"fee_payer\" => true</code> in <code>method_config</code> with either local co-signing (<code>fee_payer_private_key</code>) or hosted sponsorship (<code>fee_payer_url</code>). Sponsorship is disabled by default.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Only deployments that enable Tempo server-side fee sponsorship are affected, through `\"fee_payer\" => true` in `method_config` with either local co-signing (`fee_payer_private_key`) or hosted sponsorship (`fee_payer_url`). Sponsorship is disabled by default."
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}
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],
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"value": "Only deployments that enable Tempo server-side fee sponsorship are affected, through \"fee_payer\" => true in method_config with either local co-signing (fee_payer_private_key) or hosted sponsorship (fee_payer_url). Sponsorship is disabled by default."
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.16.1",
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"versionStartIncluding": "0.2.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Kian Kai Ang"
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},
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{
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"lang": "en",
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"type": "reporter",
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"value": "Kian Kai Ang"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "E.FU"
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},
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{
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"lang": "en",
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"type": "coordinator",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per sponsored payment by a large multiplier and to have the sponsor pay for EIP-7702 account delegations of the client's choosing.</p>\n<p>When the server sponsors Tempo payments, <code>MPP.Methods.Tempo.FeePayerPolicy.measure/3</code> in <code>lib/mpp/methods/tempo/fee_payer_policy.ex</code> bounds the gas fields, the fee budget, the validity window and the access list of the client-signed <code>0x76</code> envelope, but never reads its <code>aa_authorization_list</code> field. Every signed delegation in that list is charged as intrinsic gas before the payment call runs, so a client attaching delegations from throwaway authority keys makes the sponsor pay for them within the default <code>gas_limit</code> ceiling. At the reporter's default of seven entries the sponsored cost rises from about 46,575 gas to about 1,884,087 gas. Because each entry is applied as a persistent set-code delegation, a client can also upgrade its own accounts to delegated code at the sponsor's expense.</p>\n<p>This issue affects mpp: from 0.2.0 before 0.16.1.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per sponsored payment by a large multiplier and to have the sponsor pay for EIP-7702 account delegations of the client's choosing.\n\nWhen the server sponsors Tempo payments, `MPP.Methods.Tempo.FeePayerPolicy.measure/3` in `lib/mpp/methods/tempo/fee_payer_policy.ex` bounds the gas fields, the fee budget, the validity window and the access list of the client-signed `0x76` envelope, but never reads its `aa_authorization_list` field. Every signed delegation in that list is charged as intrinsic gas before the payment call runs, so a client attaching delegations from throwaway authority keys makes the sponsor pay for them within the default `gas_limit` ceiling. At the reporter's default of seven entries the sponsored cost rises from about 46,575 gas to about 1,884,087 gas. Because each entry is applied as a persistent set-code delegation, a client can also upgrade its own accounts to delegated code at the sponsor's expense.\n\nThis issue affects mpp: from 0.2.0 before 0.16.1."
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}
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],
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"value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per sponsored payment by a large multiplier and to have the sponsor pay for EIP-7702 account delegations of the client's choosing.\n\nWhen the server sponsors Tempo payments, MPP.Methods.Tempo.FeePayerPolicy.measure/3 in lib/mpp/methods/tempo/fee_payer_policy.ex bounds the gas fields, the fee budget, the validity window and the access list of the client-signed 0x76 envelope, but never reads its aa_authorization_list field. Every signed delegation in that list is charged as intrinsic gas before the payment call runs, so a client attaching delegations from throwaway authority keys makes the sponsor pay for them within the default gas_limit ceiling. At the reporter's default of seven entries the sponsored cost rises from about 46,575 gas to about 1,884,087 gas. Because each entry is applied as a persistent set-code delegation, a client can also upgrade its own accounts to delegated code at the sponsor's expense.\n\nThis issue affects mpp: from 0.2.0 before 0.16.1."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-130 Excessive Allocation"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 8.3,
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "LOW",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "HIGH",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-1284",
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"description": "CWE-1284 Improper Validation of Specified Quantity in Input",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-09-06T16:08:41.089Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-5qrp-r24c-w6jr"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-82750.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-82750"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/ZenHive/mpp/commit/0482572b47e1ffe1537ab80ab613d47b92833c2d"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Unbounded EIP-7702 authorization list in mpp Tempo fee-payer sponsorship inflates gas cost and sponsors account delegation",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Disable Tempo fee sponsorship by leaving <code>\"fee_payer\"</code> at its default of <code>false</code> and setting no <code>fee_payer_url</code>, so the client pays its own gas. Where sponsorship must stay enabled, lower the <code>max_gas</code> override in <code>fee_payer_policy</code> to just above what a legitimate sponsored payment needs (a TIP-20 transfer is roughly 50,000 gas), so an envelope padded with delegations either fails the policy or runs out of gas at a bounded cost. This bounds the inflation without closing it.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Disable Tempo fee sponsorship by leaving `\"fee_payer\"` at its default of `false` and setting no `fee_payer_url`, so the client pays its own gas. Where sponsorship must stay enabled, lower the `max_gas` override in `fee_payer_policy` to just above what a legitimate sponsored payment needs (a TIP-20 transfer is roughly 50,000 gas), so an envelope padded with delegations either fails the policy or runs out of gas at a bounded cost. This bounds the inflation without closing it."
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}
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],
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"value": "Disable Tempo fee sponsorship by leaving \"fee_payer\" at its default of false and setting no fee_payer_url, so the client pays its own gas. Where sponsorship must stay enabled, lower the max_gas override in fee_payer_policy to just above what a legitimate sponsored payment needs (a TIP-20 transfer is roughly 50,000 gas), so an envelope padded with delegations either fails the policy or runs out of gas at a bounded cost. This bounds the inflation without closing it."
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}
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]
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-09-08T18:25:27.116993Z",
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"id": "CVE-2026-82750",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-09-08T18:25:42.388Z"
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}
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}
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]
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}
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} |