{"id":"CVE-2026-55174","published":"2026-09-30T16:17:31.457","lastModified":"2026-09-30T20:17:33.243","description":"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.","cvssScore":5.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cwes":["CWE-345","CWE-347"],"vendors":[],"products":[],"references":[{"url":"https://github.com/shrec/UltrafastSecp256k1/commit/5478ef566c6af91b48a45c0c61f161f5b1071981","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.0","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.1","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxm","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxm","tags":[]}],"exploitRefs":[{"url":"https://github.com/shrec/UltrafastSecp256k1/commit/5478ef566c6af91b48a45c0c61f161f5b1071981","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.0","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.1","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxm","tags":[]},{"url":"https://github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxm","tags":[]}],"hasPoc":true,"ai":null}