304 lines
18 KiB
JSON
304 lines
18 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-2026-88255",
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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": "2026-09-11T18:30:01.336Z",
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"datePublished": "2026-09-16T08:24:40.446Z",
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"dateUpdated": "2026-09-16T14:49:57.782Z"
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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'"
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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.ex"
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],
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"programRoutines": [
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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": "0.16.2",
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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'"
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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.ex"
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],
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"programRoutines": [
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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": "e12bd4a1cea2e97c2a01fc059c48e5594a7b4a43",
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"status": "affected",
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"version": "f8904666061fbab695874856d8fcd02c471dfe1b",
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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>Reachable when <code>MPP.Methods.Tempo</code> broadcasts a <code>type=\"transaction\"</code> credential with a dedup store in place. From mpp 0.7.0 the dedup store is on by default (the app-started <code>MPP.Tempo.ConCacheStore</code>; opt out with <code>store: false</code>), so every default Tempo deployment from 0.7.0 before 0.16.2 is affected. Before 0.7.0 the default store was <code>nil</code>, which runs the library statelessly and provides no application-level replay protection at all, a documented property rather than part of this issue; those versions are affected only where a <code>\"store\"</code> was configured explicitly in <code>method_config</code>.</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": "Reachable when `MPP.Methods.Tempo` broadcasts a `type=\"transaction\"` credential with a dedup store in place. From mpp 0.7.0 the dedup store is on by default (the app-started `MPP.Tempo.ConCacheStore`; opt out with `store: false`), so every default Tempo deployment from 0.7.0 before 0.16.2 is affected. Before 0.7.0 the default store was `nil`, which runs the library statelessly and provides no application-level replay protection at all, a documented property rather than part of this issue; those versions are affected only where a `\"store\"` was configured explicitly in `method_config`."
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}
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],
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"value": "Reachable when MPP.Methods.Tempo broadcasts a type=\"transaction\" credential with a dedup store in place. From mpp 0.7.0 the dedup store is on by default (the app-started MPP.Tempo.ConCacheStore; opt out with store: false), so every default Tempo deployment from 0.7.0 before 0.16.2 is affected. Before 0.7.0 the default store was nil, which runs the library statelessly and provides no application-level replay protection at all, a documented property rather than part of this issue; those versions are affected only where a \"store\" was configured explicitly in method_config."
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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": "0.16.2",
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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": "E.FU"
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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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"dateAssigned": "2026-09-15T15:20:56.000Z",
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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 Unsafe Equivalence in Input in ZenHive mpp allows an unauthenticated remote client to pass the Tempo duplicate-submission gate twice with one signed transaction.</p>\n<p><code>MPP.Methods.Tempo</code> reserves the pre-broadcast dedup slot on the caller-supplied hex in <code>reserve_hash_atomic/2</code>, keyed through <code>store_key/1</code> on <code>tx.raw</code> rather than on a canonical form of the transaction. The deserializer stores the caller's hex verbatim and accepts both recovery-id encodings, so one signed transaction submitted once with <code>v=27</code> and once with <code>v=0</code> yields two distinct reserve keys, and both pass the reserve and reach the broadcast path. The plug-level credential replay store is deliberately carved out for <code>tempo</code> in <code>lib/mpp/replay.ex</code>, leaving this reserve as the only gate, and the post-broadcast mark writes the canonical hash key that the raw-keyed reserve never reads.</p>\n<p>What the duplicate submission yields depends on the node: a nonce-reuse rejection fails closed, while a node that answers with the canonical hash for an already-known transaction returns a second valid <code>Payment-Receipt</code> for a single on-chain payment.</p>\n<p>This issue affects mpp: from 0.2.0 before 0.16.2.</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 Unsafe Equivalence in Input in ZenHive mpp allows an unauthenticated remote client to pass the Tempo duplicate-submission gate twice with one signed transaction.\n\n`MPP.Methods.Tempo` reserves the pre-broadcast dedup slot on the caller-supplied hex in `reserve_hash_atomic/2`, keyed through `store_key/1` on `tx.raw` rather than on a canonical form of the transaction. The deserializer stores the caller's hex verbatim and accepts both recovery-id encodings, so one signed transaction submitted once with `v=27` and once with `v=0` yields two distinct reserve keys, and both pass the reserve and reach the broadcast path. The plug-level credential replay store is deliberately carved out for `tempo` in `lib/mpp/replay.ex`, leaving this reserve as the only gate, and the post-broadcast mark writes the canonical hash key that the raw-keyed reserve never reads.\n\nWhat the duplicate submission yields depends on the node: a nonce-reuse rejection fails closed, while a node that answers with the canonical hash for an already-known transaction returns a second valid `Payment-Receipt` for a single on-chain payment.\n\nThis issue affects mpp: from 0.2.0 before 0.16.2."
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}
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],
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"value": "Improper Validation of Unsafe Equivalence in Input in ZenHive mpp allows an unauthenticated remote client to pass the Tempo duplicate-submission gate twice with one signed transaction.\n\nMPP.Methods.Tempo reserves the pre-broadcast dedup slot on the caller-supplied hex in reserve_hash_atomic/2, keyed through store_key/1 on tx.raw rather than on a canonical form of the transaction. The deserializer stores the caller's hex verbatim and accepts both recovery-id encodings, so one signed transaction submitted once with v=27 and once with v=0 yields two distinct reserve keys, and both pass the reserve and reach the broadcast path. The plug-level credential replay store is deliberately carved out for tempo in lib/mpp/replay.ex, leaving this reserve as the only gate, and the post-broadcast mark writes the canonical hash key that the raw-keyed reserve never reads.\n\nWhat the duplicate submission yields depends on the node: a nonce-reuse rejection fails closed, while a node that answers with the canonical hash for an already-known transaction returns a second valid Payment-Receipt for a single on-chain payment.\n\nThis issue affects mpp: from 0.2.0 before 0.16.2."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-267",
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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>A client re-encodes the recovery id of a transaction it has already submitted and presents it again. The duplicate passes the only duplicate-submission gate the Tempo method has, and against a node that answers with the canonical hash for an already-known transaction the client is issued a second <code>Payment-Receipt</code> for one on-chain payment.</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": "A client re-encodes the recovery id of a transaction it has already submitted and presents it again. The duplicate passes the only duplicate-submission gate the Tempo method has, and against a node that answers with the canonical hash for an already-known transaction the client is issued a second `Payment-Receipt` for one on-chain payment."
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}
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],
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"value": "A client re-encodes the recovery id of a transaction it has already submitted and presents it again. The duplicate passes the only duplicate-submission gate the Tempo method has, and against a node that answers with the canonical hash for an already-known transaction the client is issued a second Payment-Receipt for one on-chain payment."
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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": 6.3,
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"baseSeverity": "MEDIUM",
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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:L/VA:N/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "LOW",
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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-1289",
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"description": "CWE-1289 Improper Validation of Unsafe Equivalence 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": "2026-09-16T08:24:40.446Z"
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},
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"references": [
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{
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"name": "GitHub Advisory",
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"tags": [
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"related",
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"vendor-advisory"
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],
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"url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-8x7x-5j8g-8hcx"
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},
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{
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"name": "EEF CNA record for CVE-2026-88255",
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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-2026-88255.html"
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},
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{
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"name": "OSV record EEF-CVE-2026-88255",
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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-2026-88255"
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},
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{
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"name": "Introducing commit f890466 in ZenHive/mpp",
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"tags": [
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"related"
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],
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"url": "https://github.com/ZenHive/mpp/commit/f8904666061fbab695874856d8fcd02c471dfe1b"
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},
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{
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"name": "Fix commit e12bd4a in ZenHive/mpp",
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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/e12bd4a1cea2e97c2a01fc059c48e5594a7b4a43"
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}
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],
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"source": {
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"discovery": "INTERNAL"
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},
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"title": "mpp Tempo keys its pre-broadcast dedup reserve on the caller-supplied transaction encoding, so a re-encoded signed transaction reserves a second slot"
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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": "2026-09-16T14:49:50.266563Z",
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"id": "CVE-2026-88255",
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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": "2026-09-16T14:49:57.782Z"
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}
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}
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]
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}
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} |