{"id":"CVE-2026-102946","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102946","generatedAt":"2026-10-27T23:59:17.885Z","title":"Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated.","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":"2026-10-15T19:17:13.000Z","lastModified":"2026-10-15T20:17:05.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","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"},"cwe":["CWE-290","CWE-345","CWE-347"],"affected":[],"epss":{"score":0.00117,"percentile":0.01639,"date":"2026-10-26","history":[{"date":"2026-10-16","score":0.00117,"percentile":0.01536}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-15T19:17:13.000Z","detail":{"score":"9.1","severity":"CRITICAL","publishedAt":"2026-10-15T19:17:13.423Z"},"summary":"New CVE, critical severity (CVSS 9.1)."}],"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"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102946","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}