{"cve":"CVE-2021-38195","nvd":{"published":"2021-08-08T06:15:09.117","modified":"2026-06-17T04:01:44.243","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-347"],"references":["https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.md","https://rustsec.org/advisories/RUSTSEC-2021-0076.html","https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.md","https://rustsec.org/advisories/RUSTSEC-2021-0076.html"],"products":["parity:libsecp256k1"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-38195","score":0.00909,"percentile":0.59963,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g4vj-x7v9-h82m","url":"https://osv.dev/vulnerability/GHSA-g4vj-x7v9-h82m","summary":"Overflow in libsecp256k1","modified":"2023-11-08T04:06:26.227511Z","packages":[{"ecosystem":"crates.io","name":"libsecp256k1","purl":"pkg:cargo/libsecp256k1","ranges":["<0.5.0"],"fixed":["0.5.0"]}]},{"id":"RUSTSEC-2021-0076","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0076","summary":"libsecp256k1 allows overflowing signatures","modified":"2023-11-08T04:06:26.227511Z","packages":[{"ecosystem":"crates.io","name":"libsecp256k1","purl":"pkg:cargo/libsecp256k1","ranges":[">=0.0.0-0 <0.5.0"],"fixed":["0.5.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}