CVE-2026-54431: Improper Data Validation in liboauth2
OpenIDC · liboauth2
Vendor fix available · Affected: OpenIDC liboauth2 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 7% of scored CVEs
DescriptionCVE.org
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
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- OpenIDC · liboauth2before 2.3.0
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-54431 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.