What is GHSA-qrcr-3862-9f4c?

GHSA-qrcr-3862-9f4c is a security advisory published by GitHub Security Advisories with Medium severity. liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve()...

Which CVE IDs does GHSA-qrcr-3862-9f4c cover?

GHSA-qrcr-3862-9f4c covers the following CVE IDs: CVE-2026-54430. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-qrcr-3862-9f4cMedium

liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve()...

Vendor

GitHub Security Advisories

Published

July 2, 2026

Last Modified

July 2, 2026

🔗 CVE IDs covered (1)

CVE-2026-54430 →

📋 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

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-54430
https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b
https://cert.pl/en/posts/2026/07/CVE-2026-54430
https://github.com/OpenIDC/liboauth2
https://github.com/advisories/GHSA-qrcr-3862-9f4c