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4 vulnerabilities found for liboauth2 by OpenIDC
CVE-2026-54431 (GCVE-0-2026-54431)
Vulnerability from nvd – Published: 2026-07-02 10:30 – Updated: 2026-07-02 12:16 X_Open Source
VLAI
Title
Improper Data Validation in liboauth2
Summary
In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2_token_verify() function returns success for a malformed DPoP proof that embeds the private Elliptic Curve (EC) key in the header.
This issue was fixed in version 2.3.0
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-358 - Improperly Implemented Security Check for Standard
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-54430 | third-party-advisory |
| https://github.com/OpenIDC/liboauth2 | product |
| https://github.com/OpenIDC/liboauth2/commit/c0b57… | issue-tracking |
Date Public
2026-07-02 00:00
Credits
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CVE-2026-54430 (GCVE-0-2026-54430)
Vulnerability from nvd – Published: 2026-07-02 10:30 – Updated: 2026-07-02 12:17 X_Open Source
VLAI
Title
Server-Site Request Forgery in liboauth2
Summary
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
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-54430 | third-party-advisory |
| https://github.com/OpenIDC/liboauth2 | product |
| https://github.com/OpenIDC/liboauth2/commit/34750… | issue-tracking |
Date Public
2026-07-02 00:00
Credits
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CVE-2026-54431 (GCVE-0-2026-54431)
Vulnerability from cvelistv5 – Published: 2026-07-02 10:30 – Updated: 2026-07-02 12:16 X_Open Source
VLAI
Title
Improper Data Validation in liboauth2
Summary
In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2_token_verify() function returns success for a malformed DPoP proof that embeds the private Elliptic Curve (EC) key in the header.
This issue was fixed in version 2.3.0
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-358 - Improperly Implemented Security Check for Standard
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-54430 | third-party-advisory |
| https://github.com/OpenIDC/liboauth2 | product |
| https://github.com/OpenIDC/liboauth2/commit/c0b57… | issue-tracking |
Date Public
2026-07-02 00:00
Credits
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CVE-2026-54430 (GCVE-0-2026-54430)
Vulnerability from cvelistv5 – Published: 2026-07-02 10:30 – Updated: 2026-07-02 12:17 X_Open Source
VLAI
Title
Server-Site Request Forgery in liboauth2
Summary
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
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-54430 | third-party-advisory |
| https://github.com/OpenIDC/liboauth2 | product |
| https://github.com/OpenIDC/liboauth2/commit/34750… | issue-tracking |
Date Public
2026-07-02 00:00
Credits
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"url": "https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b"
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