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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-45363 Detail

Description

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) returns a valid digest under an empty key and no empty-key precondition exists in the HMAC algorithm. The same path is reached when a keyfinder block or key_finder: argument returns an empty string, nil, or an array containing nil for an unknown key, affecting HS256, HS384, and HS512 verification through JWT.decode and JWT::EncodedToken#verify_signature!. This issue is fixed in versions 2.10.3 and 3.2.0.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/jwt/ruby-jwt/commit/9820020869ad147b941e49d96ab8beba35532964 GitHub, Inc.
https://github.com/jwt/ruby-jwt/commit/db560b769a07bd9724e77ff505011ac01872106f GitHub, Inc.
https://github.com/jwt/ruby-jwt/releases/tag/v2.10.3 GitHub, Inc.
https://github.com/jwt/ruby-jwt/releases/tag/v3.2.0 GitHub, Inc.
https://github.com/jwt/ruby-jwt/security/advisories/GHSA-c32j-vqhx-rx3x GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-287 Improper Authentication GitHub, Inc.  
CWE-326 Inadequate Encryption Strength GitHub, Inc.  
CWE-1391 Use of Weak Credentials GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-45363
NVD Published Date:
07/14/2026
NVD Last Modified:
07/14/2026
Source:
GitHub, Inc.