{"cve":"CVE-2026-39395","nvd":{"published":"2026-04-07T20:16:33.140","modified":"2026-07-24T21:10:00.143","status":"Analyzed","description":"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 and 2.6.3.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-754"],"references":["https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6"],"products":["sigstore:cosign"],"source":"nvd","synced_at":"2026-10-19T22:28:59.047572785+00:00"},"epss":{"cve":"CVE-2026-39395","score":0.00241,"percentile":0.15239,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-w6c6-c85g-mmv6","url":"https://osv.dev/vulnerability/GHSA-w6c6-c85g-mmv6","summary":"Cosign's verify-blob-attestation reports false positive when payload parsing fails","modified":"2026-09-10T03:51:03.642188195Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/cosign","purl":"pkg:golang/github.com/sigstore/cosign","ranges":[">=3.0.0 <3.0.6"],"fixed":["3.0.6"]},{"ecosystem":"Go","name":"github.com/sigstore/cosign","purl":"pkg:golang/github.com/sigstore/cosign","ranges":["<2.6.3"],"fixed":["2.6.3"]}]},{"id":"GO-2026-5694","url":"https://osv.dev/vulnerability/GO-2026-5694","summary":"Cosign's verify-blob-attestation reports false positive when payload parsing fails in github.com/sigstore/cosign","modified":"2026-06-27T02:14:27.010522086Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/cosign","purl":"pkg:golang/github.com/sigstore/cosign","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/sigstore/cosign/v2","purl":"pkg:golang/github.com/sigstore/cosign/v2","ranges":["<2.6.3"],"fixed":["2.6.3"]},{"ecosystem":"Go","name":"github.com/sigstore/cosign/v3","purl":"pkg:golang/github.com/sigstore/cosign/v3","ranges":[">=3.0.0 <3.0.6"],"fixed":["3.0.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}