{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:*",
              "cpe:2.3:a:amazon:tuftool:*:*:*:*:*:rust:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "tough-v0.22.0"
              },
              {
                "fixed": "0.22.0"
              },
              {
                "fixed": "0.15.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "606dc87a8456c8f6e24c4a85e12b280cf2c9ca00"
            }
          ],
          "repo": "https://github.com/awslabs/tough",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8m7c-8m39-rv4x"
  ],
  "database_specific": {
    "cna_assigner": "AMZN",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6966.json"
  },
  "details": "Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature, causing the client to accept forged delegated role metadata.\n\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.",
  "id": "CVE-2026-6966",
  "modified": "2026-08-12T03:51:28.213734542Z",
  "published": "2026-04-24T19:38:24.907Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-019-aws/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6966.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6966"
    },
    {
      "type": "FIX",
      "url": "https://crates.io/crates/tough/0.22.0"
    },
    {
      "type": "FIX",
      "url": "https://crates.io/crates/tuftool/0.15.0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/awslabs/tough/releases/tag/tough-v0.22.0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Signature Threshold Bypass in awslabs/tough Delegated Roles"
}