{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:sigstore:cosign:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.6.3"
              },
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.0.6"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fecddd3c22045a39f52392e71e79f66854b41352"
            },
            {
              "introduced": "9b4b74c497119b5c28b6ca60e9c1ff15bbd7164a"
            },
            {
              "fixed": "f1ad3ee952313be5d74a49d67ba0aa8d0d5e351f"
            }
          ],
          "repo": "https://github.com/sigstore/cosign",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w6c6-c85g-mmv6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-754"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39395.json"
  },
  "details": "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.",
  "id": "CVE-2026-39395",
  "modified": "2026-07-15T01:49:01.295855645Z",
  "published": "2026-04-07T20:06:28.798Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39395.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39395"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Cosign's verify-blob-attestation reports false positive when payload parsing fails"
}