CVE Explorer

CVE-2026-39395

Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 a

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6660ce58b33dc12cc913fd0a504fb13730490cf9c99508cfa7a36667e7422dcc

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"cosign","vendor":"sigstore","versions":[{"status":"affected","version":">= 3.0.0, < 3.0.6"},{"status":"affected","version":"< 2.6.3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:9944b07eac3f08a9d99f44d9f396c90701b52bfaab5e34d5776aef1e68b2bc36 · sha256:423a03426d006d82… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:9944b07eac3f08a9d99f44d9f396c90701b52bfaab5e34d5776aef1e68b2bc36 · sha256:423a03426d006d82… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-754","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:9944b07eac3f08a9d99f44d9f396c90701b52bfaab5e34d5776aef1e68b2bc36 · sha256:423a03426d006d82… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:9944b07eac3f08a9d99f44d9f396c90701b52bfaab5e34d5776aef1e68b2bc36 · sha256:423a03426d006d82… · /containers/cna/references/0

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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