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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: ruby-oauth2: CVE-2026-54603
Message-ID: <178538653011.1140345.2647796237523597877.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Thu, 30 Jul 2026 06:42:10 +0200
Delivered-To: submit@bugs.debian.org

Source: ruby-oauth2
Version: 2.0.18-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

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
]