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CVE-2026-45363

9.1 · CRITICAL

ruby-jwt is a Ruby implementation of the RFC 7519 OAuth JSON Web Token standard.

Published Jul 14, 2026CWE-287EPSS 0.36%

Overview

CVE-2026-45363 is a critical-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/jwt/ruby-jwt/commit/9820020869ad147b941e49d96ab8beba35532964GitHubgithub.com/jwt/ruby-jwt/commit/db560b769a07bd9724e77ff505011ac01872106fGitHubgithub.com/jwt/ruby-jwt/releases/tag/v2.10.3GitHubgithub.com/jwt/ruby-jwt/releases/tag/v3.2.0GitHubgithub.com/jwt/ruby-jwt/security/advisories/GHSA-c32j-vqhx-rx3x

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45363?

CVE-2026-45363 is a critical-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-45363?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-45363?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-45363?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45363 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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