CVE-2026-54430

UNKNOWN 0.0

Server-Site Request Forgery in liboauth2

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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

CWE	CWE-918
Vendor	openidc
Product	liboauth2
Published	Jul 2, 2026
Last Updated	Jul 2, 2026

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Affected Versions

OpenIDC / liboauth2

0 < 2.3.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cert.pl: https://cert.pl/en/posts/2026/07/CVE-2026-54430 github.com: https://github.com/OpenIDC/liboauth2 github.com: https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)