CVE-2026-54431
Improper Data Validation in liboauth2
Description
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
INFO
Published Date :
July 2, 2026, 10:30 a.m.
Last Modified :
July 2, 2026, 10:30 a.m.
Remotely Exploit :
No
Source :
CERT-PL
Affected Products
The following products are affected by CVE-2026-54431
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 4bb8329e-dd38-46c1-aafb-9bf32bcb93c6 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update liboauth2 to version 2.3.0.
- Ensure DPoP verifier rejects private JWK headers.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-54431 vulnerability anywhere in the article.
-
cert.pl
Vulnerabilities in OpenIDC liboauth2 software
Vulnerabilities in OpenIDC liboauth2 software CVE ID CVE-2026-54430 Publication date 02 July 2026 Vendor OpenIDC Product liboauth2 Vulnerable versions All before 2.3.0 Vulnerability type (CWE) Server- ... Read more