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{"affected": [{"affectedData": [{"product": "joserfc", "vendor": "authlib", "versions": [{"status": "affected", "version": "< 1.7.4"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4."}], "id": "CVE-2026-102946", "lastModified": "2026-10-15T20:17:05.407", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-102946", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T19:52:38.661517Z", "version": "2.0.3"}}]}, "published": "2026-10-15T19:17:13.423", "references": [{"source": "[email protected]", "url": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"}, {"source": "[email protected]", "url": "https://github.com/authlib/joserfc/releases/tag/1.7.4"}, {"source": "[email protected]", "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-347"}], "source": "[email protected]", "type": "Secondary"}]}

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