Vulnerability Description
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
Related Weaknesses (CWE)
References
- https://cert.pl/en/posts/2026/07/CVE-2026-54430
- https://github.com/OpenIDC/liboauth2
- https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4
FAQ
What is CVE-2026-54430?
CVE-2026-54430 is a documented vulnerability. 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 ...
How severe is CVE-2026-54430?
CVSS scoring is not yet available for CVE-2026-54430. Check NVD for updates.
Is there a patch for CVE-2026-54430?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.