{"cve":"CVE-2018-1000539","nvd":{"published":"2018-06-26T16:29:02.163","modified":"2026-06-17T01:32:52.310","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-347"],"references":["https://github.com/nov/json-jwt/pull/62","https://www.debian.org/security/2018/dsa-4283","https://github.com/nov/json-jwt/pull/62","https://www.debian.org/security/2018/dsa-4283"],"products":["json-jwt_project:json-jwt"],"source":"nvd","synced_at":"2026-10-19T20:51:47.459859389+00:00"},"epss":{"cve":"CVE-2018-1000539","score":0.00777,"percentile":0.55858,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mj4x-wcxf-hm8x","url":"https://osv.dev/vulnerability/GHSA-mj4x-wcxf-hm8x","summary":"Json-jwt did not verify the cryptographic signature for data","modified":"2024-02-16T08:20:39.365001Z","packages":[{"ecosystem":"RubyGems","name":"json-jwt","purl":"pkg:gem/json-jwt","ranges":[">=0.5.1 <1.9.4"],"fixed":["1.9.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}