{"identifier":"CVE-2026-102946","cve":{"id":"CVE-2026-102946","description":"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.","published":"2026-10-15T19:17:13.423000+00:00","modified":"2026-10-15T20:17:05.407000+00:00","status":"Deferred","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cvss_version":"3.1","affected":[],"weaknesses":["CWE-290","CWE-345","CWE-347"],"references":[{"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","source":"security-advisories@github.com"},{"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-15T19:52:38.661517Z","id":"CVE-2026-102946","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[],"source":"nvd","retrieved_at":"2026-10-28T10:22:44.774964+00:00","exploited":false,"kev_stale":false,"products":[],"priority":{"label":"Critical technical severity","reasons":["CVSS is at least 9.0; exploitation is not established by severity alone."]},"epss":{"probability":0.00117,"percentile":0.01639,"date":"2026-10-29","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"github.com","source_url":"https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe","investigate_url":"https://investigate.aeglixmind.com/#github.com"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-102946","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-102946","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-102946","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}