CVE-2026-114620

{"id": "CVE-2026-114620", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-114620", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-30T20:14:23.536072Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.2}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "authlib", "product": "authlib", "versions": [{"status": "affected", "version": "< 1.9.0"}]}]}], "published": "2026-10-22T22:18:05.090", "references": [{"url": "https://github.com/authlib/authlib/commit/6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/commit/891e3f10ae5989176211f8be35dcc7cd40aa92c6", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/pull/949", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/releases/tag/v1.9.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC 9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the abstract get_request_object() hook before applying a destination or registration policy; the hook itself performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who knows a valid public client identifier can make the authorization server request internal, link-local, or otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing. Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval limits are not affected. The JWTAuthenticationRequest implementation in authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0."}], "lastModified": "2026-10-30T21:16:50.870", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81C43B00-A297-4572-B0F3-08E959A594F2", "versionEndExcluding": "1.9.0", "versionStartIncluding": "1.6.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}