Bug 2496724

Summary:	CVE-2026-54430 liboauth2: liboauth2: Server-Side Request Forgery allows unauthorized internal network access [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Jeremy Choi <jechoi>
Component:	liboauth2	Assignee:	Alexander Bokovoy <abokovoy>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	abokovoy
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["03962fda-049c-4644-9d75-356779b83aef"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2496465

Description Jeremy Choi 2026-07-03 02:02:25 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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