{"id":"CVE-2018-1000539","aliases":["GHSA-mj4x-wcxf-hm8x"],"url":"https://o3.security/vulnerability/CVE-2018-1000539","summary":"Json-jwt did not verify the cryptographic signature for data","details":"Nov json-jwt version >= 0.5.0 && < 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 1.9.4 and later.","published":"2018-06-26T16:29:02.163Z","modified":"2026-07-08T14:58:39.189750Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"json-jwt","fixedVersion":"1.9.4"}],"fix":{"url":"https://github.com/nov/json-jwt/pull/62","label":"nov/json-jwt#62"},"references":[{"type":"ADVISORY","url":"https://github.com/nov/json-jwt/pull/62"},{"type":"ADVISORY","url":"https://www.debian.org/security/2018/dsa-4283"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T14:58:39.189750Z"}}