This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-54430 →
DEBIAN-CVE-2026-54430
liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid...
Original description
The description as published by the source.
liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:13
liboauth2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:14
liboauth2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-1"}]}]
References
- advisory security-tracker.debian.org