CVE-2017-18239

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.0 9.8/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0Patch, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/issues/12Issue Tracking, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/pull/36Issue Tracking, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0Patch, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/issues/12Issue Tracking, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/pull/36Issue Tracking, Third Party Advisory

Timeline

Published: Mar 18, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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