CVE-2015-9235
EPSS 37.5%Verification Bypass in jsonwebtoken
Published: 10/9/2018Modified: 2/4/2026
Description
Versions 4.2.1 and earlier of `jsonwebtoken` are affected by a verification bypass vulnerability. This is a result of weak validation of the JWT algorithm type, occuring when an attacker is allowed to arbitrarily specify the JWT algorithm. ## Recommendation Update to version 4.2.2 or later.
Affected packages (1)
- npm/jsonwebtokenfrom 0, < 4.2.2
References (6)
- ADVISORYhttps://github.com/advisories/GHSA-c7hr-j4mj-j2w6
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2015-9235
- WEBhttps://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries
- WEBhttps://github.com/auth0/node-jsonwebtoken/commit/1bb584bc382295eeb7ee8c4452a673a77a68b687
- WEBhttps://www.npmjs.com/advisories/17
- WEBhttps://www.timmclean.net/2015/02/25/jwt-alg-none.html