SSRF via unencoded AWS ALB key identifier
Published Jul 2, 2026 · Updated Jul 2, 2026
SSRF in OpenIDC liboauth2 before 2.3.0 allows attackers to make a server request an attacker-chosen internal path. The oauth2_jose_jwks_aws_alb_resolve() function appends the unverified JWT kid value to alb_base_url without URL encoding or path sanitization and sends the GET before signature verification. Exploitation requires AWS ALB verification, a signer value matching the configured ARN, and control of the JWT header; the bounded effect is an outbound GET to an internal path.
Summary
What happened
SSRF in OpenIDC liboauth2 before 2.3.0 allows attackers to make a server request an attacker-chosen internal path. The oauth2_jose_jwks_aws_alb_resolve() function appends the unverified JWT kid value to alb_base_url without URL encoding or path sanitization and sends the GET before signature verification. Exploitation requires AWS ALB verification, a signer value matching the configured ARN, and control of the JWT header; the bounded effect is an outbound GET to an internal path.
The record
- CVE
- CVE-2026-54430
- Published
- Jul 2, 2026
- Updated
- Jul 2, 2026
- Vendor
- OpenIDC
- Product
- liboauth2
- Classifications
- CWE-918
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 2, 2026CVE publishedPublication date reported by the CVE source.
- Jul 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <2.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo