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VULNERABILITIES

CVE-2026-54431 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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

Metrics

CVSS 3.x Severity and Vector Strings:

NDDVolerionCVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://cert.pl/en/posts/2026/07/CVE-2026-54430 [email protected]
https://github.com/OpenIDC/liboauth2 [email protected]ProductSource CodeVendor
https://github.com/OpenIDC/liboauth2/commit/c0b57152ed6a0af33aeb04a60bd7f5bff5ab8800 [email protected]Source CodeVendor

Weakness Enumeration

CWE-IDCWE NameSource
CWE-358Improperly Implemented Security Check for Standard[email protected]

Affected Products

ProductVersions
OpenIDC liboauth2
< 2.3.0 (semver)

CPE

  • No CPEs found in CPE dictionary for this product.

Remediation

  • Upgrade: 2.3.0moderate effort

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-54431
NVD Published Date:
Jul 2, 2026
NVD Last Modified:
Jul 2, 2026
Source:
[email protected]
CVE-2026-54431 Details - Not Deferred