Auth bypass in Jwt Ruby-jwt
CVE-2026-45363
ruby-jwt is a Ruby implementation of the RFC 7519 OAuth JSON Web Token standard. Prior to 2.10.3 and 3.2.0, JWT.decode(token, '', true, algorithm: 'HS256') accepts an attacker-forged token because OpenSSL::HMAC.digest('SHA256', '', payload…
Vulnerability class: Broken Authentication
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Jwt Ruby-jwt — versions < 2.10.3, >= 3.0.0, < 3.2.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-45363?
- CVE-2026-45363 is a critical-severity vulnerability in Jwt Ruby-jwt, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-07-14.
- How severe is CVE-2026-45363?
- Critical severity. CVSS v3 base score is 9.1 out of 10.