{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.2.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5478ef566c6af91b48a45c0c61f161f5b1071981"
            },
            {
              "fixed": "ab0fd795a98a34615b44365673fb87498a05daa5"
            },
            {
              "fixed": "c961f2d04ead4afe60641a4980ba753da1fa08c5"
            }
          ],
          "repo": "https://github.com/shrec/ultrafastsecp256k1",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c7q2-gv3g-rgxm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-345",
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55174.json"
  },
  "details": "UltrafastSecp256k1 is a high-performance, multi-backend secp256k1 engine with reproducible audit evidence, compatibility shims, and profile-based review scopes. Prior to version 4.2.0, UltrafastSecp256k1's ECDSA adaptor pre-signature verification accepts forged adaptor pre-signatures whose \"r\" value is not cryptographically bound to the adaptor point \"T\". This issue has been patched in version 4.2.0.",
  "id": "CVE-2026-55174",
  "modified": "2026-10-02T03:30:27.397736168Z",
  "published": "2026-09-30T15:49:10.453Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55174.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55174"
    },
    {
      "type": "FIX",
      "url": "https://github.com/shrec/UltrafastSecp256k1/commit/5478ef566c6af91b48a45c0c61f161f5b1071981"
    }
  ],
  "schema_version": "1.9.0",
  "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": "UltrafastSecp256k1: ECDSA adaptor verification accepts non-adaptable pre-signatures due to missing DLEQ binding"
}