{"schemaVersion":3,"id":"CVE-2026-102946","aliases":["UBUNTU-CVE-2026-102946","DEBIAN-CVE-2026-102946"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-10-15T18:28:06.913Z","modified":"2026-10-15T19:53:09.069Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.1,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Bypass by Spoofing","description":"This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/290.html"},{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity","description":"The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/345.html"},{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature","description":"The product does not verify, or incorrectly verifies, the cryptographic signature for 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MISC","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-102946","label":"ubuntu.com/security/CVE-2026-102946","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102946","label":"www.cve.org/CVERecord?id=CVE-2026-102946","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-102946","label":"security-tracker.debian.org/tracker/CVE-2026-102946","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-15T18:28:06.913Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-15T19:53:09.069Z","label":"Last modified","detail":"Vulnerability information 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