{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:sigstore:sigstore-go:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.2.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8ca80c47ef03d26ebf174db7c296700b075b2c16"
            },
            {
              "fixed": "dbb07e62623edd5b175fb9dd5a41dcb85a159207"
            }
          ],
          "repo": "https://github.com/sigstore/sigstore-go",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9vcr-p3rj-q5q6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49834.json"
  },
  "details": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N\u003e1) or WithSignedCertificateTimestamps(N\u003e1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.",
  "id": "CVE-2026-49834",
  "modified": "2026-08-07T11:31:34.918697194Z",
  "published": "2026-07-17T19:20:06.140Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49834.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49834"
    },
    {
      "type": "FIX",
      "url": "https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207"
    },
    {
      "type": "FIX",
      "url": "https://github.com/sigstore/sigstore-go/pull/633"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sigstore-go: Multi-log threshold bypass via single compromised log"
}