CVE-2026-54603

Description

OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect (OIDC). From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Client#request overrides the request authority, so the bearer Authorization header is sent to an attacker-controlled host, leaking the credential. This issue is fixed in version 2.0.22.

CVSS Vector

References

• https://github.com/ruby-oauth/oauth2/commit/0f0a474f1b38453e119e660c2daca742d4378ce9
• https://github.com/ruby-oauth/oauth2/releases/tag/v2.0.22
• https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9
• https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9