{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-102946", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-29T20:24:43.341Z", "datePublished": "2026-10-15T18:28:06.913Z", "dateUpdated": "2026-10-15T19:53:09.069Z"}, "containers": {"cna": {"title": "joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json", "problemTypes": [{"descriptions": [{"cweId": "CWE-290", "lang": "en", "description": "CWE-290: Authentication Bypass by Spoofing", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-345", "lang": "en", "description": "CWE-345: Insufficient Verification of Data Authenticity", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-347", "lang": "en", "description": "CWE-347: Improper Verification of Cryptographic Signature", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"name": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"}, {"name": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"}, {"name": "https://github.com/authlib/joserfc/releases/tag/1.7.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/joserfc/releases/tag/1.7.4"}], "affected": [{"vendor": "authlib", "product": "joserfc", "versions": [{"version": "< 1.7.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-15T18:28:06.913Z"}, "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."}], "source": {"advisory": "GHSA-4pp3-559j-c5c2", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-15T19:52:38.661517Z", "id": "CVE-2026-102946", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T19:53:09.069Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "joserfc", "vendor": "authlib", "versions": [{"status": "affected", "version": "< 1.7.4"}]}], "source": "security-advisories@github.com"}], "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": "2026-10-15T19:17:13.560", "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": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-15T19:17:13.423", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/joserfc/releases/tag/1.7.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-347"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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