CVE-2026-54430
Medium
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
SeverityMedium
CVSS5.1
Exploit probability—
ProductOpenidc Liboauth2
PublishedJul 2, 2026
First seenJul 2, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- OpenIDC liboauth22.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| OpenIDC liboauth2 | v < 2.3.0 | 2.3.0 |
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