Bug 2496465 (CVE-2026-54430)

Summary: CVE-2026-54430 liboauth2: liboauth2: Server-Side Request Forgery allows unauthorized internal network access
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in liboauth2 in the oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB JWT verifier reads the signer and kid fields from the unverified JWT header. When signer matches the configured ARN, kid is appended to the ALB base URL without path sanitization, and an HTTP GET request is issued before signature verification. An attacker who can present a crafted JWT to an endpoint using AWS ALB verification could force the server to issue GET requests to unintended internal paths, potentially disclosing limited information from internal services.
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Bug Depends On: 2496724    
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Description OSIDB Bzimport 2026-07-02 11:01:34 UTC 
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