{"cve":"CVE-2017-18239","nvd":{"published":"2018-03-18T03:29:00.213","modified":"2026-06-17T01:12:27.637","status":"Modified","description":"A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0","https://github.com/jasongoodwin/authentikat-jwt/issues/12","https://github.com/jasongoodwin/authentikat-jwt/pull/36","https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0","https://github.com/jasongoodwin/authentikat-jwt/issues/12"],"products":["authentikat-jwt_project:authentikat-jwt"],"source":"nvd","synced_at":"2026-10-19T20:48:50.842038930+00:00"},"epss":{"cve":"CVE-2017-18239","score":0.01963,"percentile":0.80336,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3rhm-67j6-42jq","url":"https://osv.dev/vulnerability/GHSA-3rhm-67j6-42jq","summary":"Exposure of Sensitive information in authentikat-jwt","modified":"2024-12-02T05:49:07.423751Z","packages":[{"ecosystem":"Maven","name":"com.jason-goodwin:authentikat-jwt_2.12","purl":"pkg:maven/com.jason-goodwin/authentikat-jwt_2.12","ranges":["<0.4.6"],"fixed":["0.4.6"]}]}],"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."]}