CVE Explorer

CVE-2026-54431

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

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8a9add289a7741ab526fd22ab790f09a30268c81da927310dc739c8d908276fa

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"liboauth2","programFiles":["src/dpop.c"],"programRoutines":[{"name":"_oauth2_dpop_parse_and_validate()"}],"repo":"https://github.com/OpenIDC/liboauth2","vendor":"OpenIDC","versions":[{"lessThan":"2.3.0","status":"affected","version":"0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:db875e1d9a94d49ec5d772cd862f3d30a3cd8edf2338f3fb26901a0673fca13f · sha256:76e9388a239daff8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:db875e1d9a94d49ec5d772cd862f3d30a3cd8edf2338f3fb26901a0673fca13f · sha256:76e9388a239daff8… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-358","description":"CWE-358 Improperly Implemented Security Check for Standard","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:db875e1d9a94d49ec5d772cd862f3d30a3cd8edf2338f3fb26901a0673fca13f · sha256:76e9388a239daff8… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"tags":["third-party-advisory"],"url":"https://cert.pl/en/posts/2026/07/CVE-2026-54430"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:db875e1d9a94d49ec5d772cd862f3d30a3cd8edf2338f3fb26901a0673fca13f · sha256:76e9388a239daff8… · /containers/cna/references/0

{"tags":["product"],"url":"https://github.com/OpenIDC/liboauth2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:db875e1d9a94d49ec5d772cd862f3d30a3cd8edf2338f3fb26901a0673fca13f · sha256:76e9388a239daff8… · /containers/cna/references/1

{"tags":["issue-tracking"],"url":"https://github.com/OpenIDC/liboauth2/commit/c0b57152ed6a0af33aeb04a60bd7f5bff5ab8800"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:db875e1d9a94d49ec5d772cd862f3d30a3cd8edf2338f3fb26901a0673fca13f · sha256:76e9388a239daff8… · /containers/cna/references/2

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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