CVE-2026-82753

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CIMD is off by default.</p>"}, {"base64": false, "type": "text/markdown", "value": "Reachable only when the client resource has Client ID Metadata Documents enabled (`cimd_enabled?: true`) and the authorize endpoint is exposed. CIMD is off by default."}], "value": "Reachable only when the client resource has Client ID Metadata Documents enabled (cimd_enabled?: true) and the authorize endpoint is exposed. CIMD is off by default."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.3.1", "versionStartIncluding": "0.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}, {"lang": "en", "type": "reporter", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation developer", "value": "Zach Daniel / Ash Project"}, {"lang": "en", "type": "coordinator", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory.</p>\n<p>The <code>/authorize</code> endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, <code>resolve_client/3</code> in <code>AshAuthentication.Oauth2Server.CIMD</code> fetches the document for each new URL-shaped <code>client_id</code> and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in <code>CIMD.Cache</code> before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound.</p>\n<p>This issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.</p>"}, {"base64": false, "type": "text/markdown", "value": "Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory.\n\nThe `/authorize` endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, `resolve_client/3` in `AshAuthentication.Oauth2Server.CIMD` fetches the document for each new URL-shaped `client_id` and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in `CIMD.Cache` before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound.\n\nThis issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1."}], "value": "Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory.\n\nThe /authorize endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, resolve_client/3 in AshAuthentication.Oauth2Server.CIMD fetches the document for each new URL-shaped client_id and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in CIMD.Cache before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound.\n\nThis issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1."}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.2, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-07T22:23:08.176Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/ash-project/ash_authentication_oauth2_server/security/advisories/GHSA-9pv3-wxjm-f846"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-82753.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82753"}, {"tags": ["patch"], "url": "https://github.com/ash-project/ash_authentication_oauth2_server/commit/45e24f69e0f95d67413e2508acc2264156acb5ac"}], "source": {"discovery": "EXTERNAL"}, "title": "Unauthenticated authorize requests create unbounded, never-expiring CIMD client rows and cache entries in ash_authentication_oauth2_server"}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T14:39:20.932056Z", "id": "CVE-2026-82753", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T14:39:54.464Z"}}]}}

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With Client ID Metadata Documents enabled, resolve_client/3 in AshAuthentication.Oauth2Server.CIMD fetches the document for each new URL-shaped client_id and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in CIMD.Cache before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound.\n\nThis issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.", "supportingMedia": [{"type": "text/html", "value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory.</p>\n<p>The <code>/authorize</code> endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, <code>resolve_client/3</code> in <code>AshAuthentication.Oauth2Server.CIMD</code> fetches the document for each new URL-shaped <code>client_id</code> and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in <code>CIMD.Cache</code> before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound.</p>\n<p>This issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.</p>", "base64": false}, {"type": "text/markdown", "value": "Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory.\n\nThe `/authorize` endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, `resolve_client/3` in `AshAuthentication.Oauth2Server.CIMD` fetches the document for each new URL-shaped `client_id` and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in `CIMD.Cache` before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound.\n\nThis issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "configurations": [{"lang": "en", "value": "Reachable only when the client resource has Client ID Metadata Documents enabled (cimd_enabled?: true) and the authorize endpoint is exposed. CIMD is off by default.", "supportingMedia": [{"type": "text/html", "value": "<p>Reachable only when the client resource has Client ID Metadata Documents enabled (<code>cimd_enabled?: true</code>) and the authorize endpoint is exposed. CIMD is off by default.</p>", "base64": false}, {"type": "text/markdown", "value": "Reachable only when the client resource has Client ID Metadata Documents enabled (`cimd_enabled?: true`) and the authorize endpoint is exposed. CIMD is off by default.", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "0.3.1", "versionStartIncluding": "0.3.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-07T22:23:08.176Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-82753", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T14:39:20.932056Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-09-08T14:39:51.002Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-82753", "state": "PUBLISHED", "dateUpdated": "2026-09-07T22:23:08.176Z", "dateReserved": "2026-08-31T01:00:10.817Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-09-07T22:23:08.176Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshAuthentication.Oauth2Server.CIMD'"], "packageName": "ash_authentication_oauth2_server", "packageURL": "pkg:hex/ash_authentication_oauth2_server", "product": "ash_authentication_oauth2_server", "programFiles": ["lib/ash_authentication/oauth2_server/cimd.ex"], "programRoutines": [{"name": "'Elixir.AshAuthentication.Oauth2Server.CIMD':resolve_client/3"}], "repo": "https://github.com/ash-project/ash_authentication_oauth2_server", "vendor": "ash-project", "versions": [{"lessThan": "0.3.1", "status": "affected", "version": "0.3.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshAuthentication.Oauth2Server.CIMD'"], "packageName": "ash-project/ash_authentication_oauth2_server", "packageURL": "pkg:github/ash-project/ash_authentication_oauth2_server", "product": "ash_authentication_oauth2_server", "programFiles": ["lib/ash_authentication/oauth2_server/cimd.ex"], "programRoutines": [{"name": "'Elixir.AshAuthentication.Oauth2Server.CIMD':resolve_client/3"}], "repo": "https://github.com/ash-project/ash_authentication_oauth2_server", "vendor": "ash-project", "versions": [{"lessThan": "45e24f69e0f95d67413e2508acc2264156acb5ac", "status": "affected", "version": "e713a9ba816761140c226e2ca55b75c0b93f5984", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory.\n\nThe /authorize endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, resolve_client/3 in AshAuthentication.Oauth2Server.CIMD fetches the document for each new URL-shaped client_id and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in CIMD.Cache before validation, so even rejected documents held cache memory until their TTL. 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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.3.0,0.3.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ash_authentication_oauth2_server", "source": "cna", "vendor": "ash-project"}, "product": "ash_authentication_oauth2_server", "vendor": "ash-project"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e713a9ba816761140c226e2ca55b75c0b93f5984,45e24f69e0f95d67413e2508acc2264156acb5ac)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ash_authentication_oauth2_server", "source": "cna", "vendor": "ash-project"}, "product": "ash_authentication_oauth2_server", "vendor": "ash-project"}], "created": "2026-09-07T23:30:17.863794+00:00", "updated": "2026-09-08T20:36:43.171899+00:00", "vendors": ["ash-project", "ash-project$PRODUCT$ash_authentication_oauth2_server"]}