312 lines
16 KiB
JSON
312 lines
16 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-2026-54894",
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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": "2026-06-16T10:47:13.915Z",
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"datePublished": "2026-08-01T18:46:05.861Z",
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"dateUpdated": "2026-08-03T17:49:54.220Z"
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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:ueberauth:guardian:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Guardian.Plug.Keys'"
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],
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"packageName": "guardian",
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"packageURL": "pkg:hex/guardian",
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"product": "guardian",
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"programFiles": [
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"lib/guardian/plug/keys.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Guardian.Plug.Keys':base_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':claims_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':resource_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':token_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':key_from_other/1"
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}
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],
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"repo": "https://github.com/ueberauth/guardian",
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"vendor": "ueberauth",
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"versions": [
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{
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"lessThan": "2.4.1",
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"status": "affected",
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"version": "0.1.0",
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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:ueberauth:guardian:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Guardian.Plug.Keys'"
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],
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"packageName": "ueberauth/guardian",
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"packageURL": "pkg:github/ueberauth/guardian",
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"product": "guardian",
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"programFiles": [
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"lib/guardian/plug/keys.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Guardian.Plug.Keys':base_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':claims_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':resource_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':token_key/1"
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},
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{
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"name": "'Elixir.Guardian.Plug.Keys':key_from_other/1"
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}
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],
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"repo": "https://github.com/ueberauth/guardian",
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"vendor": "ueberauth",
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"versions": [
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{
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"lessThan": "2952657e42e6341a67e6aaad09d8f0b40ae917cb",
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"status": "affected",
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"version": "7126fa433afc2563fcac0c9aa35193965f8fd5f8",
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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 applications that derive a Guardian key (the conn/session namespace) from attacker-influenced data are exploitable. This is the case when a caller-supplied value such as a tenant identifier, request header, or other request input is passed as the <tt>:key</tt> option to entry points like <tt>Guardian.Plug.current_token/2</tt>. Applications that use a static namespace (the default <tt>:default</tt> key or hardcoded atoms) are not affected.</p>"
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}
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],
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"value": "Only applications that derive a Guardian key (the conn/session namespace) from attacker-influenced data are exploitable. This is the case when a caller-supplied value such as a tenant identifier, request header, or other request input is passed as the :key option to entry points like Guardian.Plug.current_token/2. Applications that use a static namespace (the default :default key or hardcoded atoms) are not affected."
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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:ueberauth:guardian:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "2.4.1",
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"versionStartIncluding": "0.1.0",
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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": "Peter Ullrich"
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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": "Yordis Prieto"
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},
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{
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"lang": "en",
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"type": "analyst",
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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>Allocation of Resources Without Limits or Throttling in ueberauth guardian allows denial of service via unbounded atom creation from attacker-influenced binary input.</p><p><tt>Guardian.Plug.Keys</tt> derives connection and session namespace keys by passing arbitrary binaries to <tt>String.to_atom/1</tt>. <tt>base_key/1</tt> in <tt>lib/guardian/plug/keys.ex</tt> converts any binary into the atom <tt>:\"guardian_<input>\"</tt>, and the derived helpers <tt>claims_key/1</tt>, <tt>resource_key/1</tt>, and <tt>token_key/1</tt> create a second atom on top of that. <tt>key_from_other/1</tt> likewise converts a regex-captured binary through <tt>String.to_atom/1</tt>. The public specs advertise <tt>String.t()</tt> as a valid argument, so passing a string is documented usage, and higher-level entry points such as <tt>Guardian.Plug.current_token(conn, key: key)</tt> thread the caller-supplied key straight into these functions.</p><p><tt>String.to_atom/1</tt> creates a brand-new atom for every previously unseen binary, atoms are never garbage collected, and the BEAM atom table is fixed at roughly 1,048,576 entries by default. An application that routes attacker-influenced data (a tenant identifier, header, or other request input) into a Guardian key therefore mints one permanent atom per distinct value. A modest stream of varied, unauthenticated input permanently consumes the atom table and crashes the BEAM node, taking down every application running on it.</p><p>This issue affects guardian: from 0.1.0 before 2.4.1.</p>"
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling in ueberauth guardian allows denial of service via unbounded atom creation from attacker-influenced binary input.\n\nGuardian.Plug.Keys derives connection and session namespace keys by passing arbitrary binaries to String.to_atom/1. base_key/1 in lib/guardian/plug/keys.ex converts any binary into the atom :\"guardian_<input>\", and the derived helpers claims_key/1, resource_key/1, and token_key/1 create a second atom on top of that. key_from_other/1 likewise converts a regex-captured binary through String.to_atom/1. The public specs advertise String.t() as a valid argument, so passing a string is documented usage, and higher-level entry points such as Guardian.Plug.current_token(conn, key: key) thread the caller-supplied key straight into these functions.\n\nString.to_atom/1 creates a brand-new atom for every previously unseen binary, atoms are never garbage collected, and the BEAM atom table is fixed at roughly 1,048,576 entries by default. An application that routes attacker-influenced data (a tenant identifier, header, or other request input) into a Guardian key therefore mints one permanent atom per distinct value. A modest stream of varied, unauthenticated input permanently consumes the atom table and crashes the BEAM node, taking down every application running on it.\n\nThis issue affects guardian: from 0.1.0 before 2.4.1."
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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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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "LOCAL",
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"baseScore": 6.9,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "NONE",
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"subAvailabilityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE"
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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-770",
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"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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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": "2026-08-01T18:46:05.861Z"
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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/ueberauth/guardian/security/advisories/GHSA-xqch-c77q-rgh5"
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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-2026-54894.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-2026-54894"
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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/ueberauth/guardian/commit/2952657e42e6341a67e6aaad09d8f0b40ae917cb"
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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": "Atom-table exhaustion denial of service in Guardian via unbounded atom creation from binary keys",
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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>Do not derive Guardian keys from untrusted input. Use a fixed, hardcoded set of namespace keys, or validate the value against a bounded allowlist of known keys, before passing it as the <tt>:key</tt> option.</p>"
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}
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],
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"value": "Do not derive Guardian keys from untrusted input. Use a fixed, hardcoded set of namespace keys, or validate the value against a bounded allowlist of known keys, before passing it as the :key option."
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/ueberauth/guardian/security/advisories/GHSA-xqch-c77q-rgh5",
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"tags": [
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"exploit"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-03T17:49:32.217048Z",
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"id": "CVE-2026-54894",
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"options": [
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{
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"Exploitation": "poc"
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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": "2026-08-03T17:49:54.220Z"
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}
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}
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]
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}
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} |