Bug#1143054: ruby-oauth2: CVE-2026-54603

Source: ruby-oauth2
Version: 2.0.18-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for ruby-oauth2.

CVE-2026-54603[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-54603
    https://www.cve.org/CVERecord?id=CVE-2026-54603
[1] https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9
[2] https://github.com/ruby-oauth/oauth2/commit/0f0a474f1b38453e119e660c2daca742d4378ce9

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore