{"id":"CVE-2021-38195","aliases":["GHSA-g4vj-x7v9-h82m","RUSTSEC-2021-0076"],"url":"https://o3.security/vulnerability/CVE-2021-38195","summary":"Overflow in libsecp256k1","details":"An issue was discovered in the libsecp256k1 crate before 0.5.0 for Rust. It can verify an invalid signature because it allows the R or S parameter to be larger than the curve order, aka an overflow.","published":"2021-08-08T06:15:09.117Z","modified":"2026-09-30T14:03:43.770105Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"crates.io","name":"libsecp256k1","fixedVersion":"0.5.0"}],"fix":{"url":"https://github.com/paritytech/libsecp256k1/pull/67","label":"paritytech/libsecp256k1#67"},"references":[{"type":"ADVISORY","url":"https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.md"},{"type":"FIX","url":"https://rustsec.org/advisories/RUSTSEC-2021-0076.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38195"},{"type":"WEB","url":"https://github.com/paritytech/libsecp256k1/pull/67"},{"type":"PACKAGE","url":"https://github.com/paritytech/libsecp256k1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-30T14:03:43.770105Z"}}