{"id":"CVE-2019-20399","aliases":["GHSA-7cqg-8449-rmfv","RUSTSEC-2020-0156"],"url":"https://o3.security/vulnerability/CVE-2019-20399","summary":"Observable Discrepancy in libsecp256k1-rs","details":"A timing vulnerability in the Scalar::check_overflow function in Parity libsecp256k1-rs before 0.3.1 potentially allows an attacker to leak information via a side-channel attack.","published":"2020-01-23T00:15:09.953Z","modified":"2026-07-08T20:04:53.389395Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"libsecp256k1-rs","fixedVersion":"0.3.1"}],"fix":{"url":"https://github.com/paritytech/libsecp256k1/commit/11ba23a9766a5079918cd9f515bc100bc8164b50","label":"paritytech/libsecp256k1@11ba23a"},"references":[{"type":"FIX","url":"https://github.com/paritytech/libsecp256k1/commit/11ba23a9766a5079918cd9f515bc100bc8164b50"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:04:53.389395Z"}}