Rust advisories / libsecp256k1-rs
Vulnerability MediumRUSTSEC-2020-0156 · libsecp256k1-rs
RUSTSEC-2020-0156: Observable Discrepancy in libsecp256k1-rs
Short answerA security vulnerability in the libsecp256k1-rs crate: Observable Discrepancy in libsecp256k1-rs. Medium severity (CVSS 5.9). Fixed in 0.3.1: update to a fixed version.
| Crate | libsecp256k1-rs |
|---|---|
| Type | Vulnerability (crypto-failure) |
| Affected versions | Before 0.3.1. |
| Fixed in | 0.3.1 |
| Severity | Medium, CVSS 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| Published | 2020-01-22 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2019-20399, GHSA-7cqg-8449-rmfv |
What to do
- See which version you have:
cargo tree -i libsecp256k1-rs(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p libsecp256k1-rs. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplelibsecp256k1-rs = "0.3.1") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
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.
References
- Package: crates.io/crates/libsecp256k1-rs
- Advisory: rustsec.org/advisories/RUSTSEC-2020-0156.html
- Web: nvd.nist.gov/vuln/detail/CVE-2019-20399
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Up next
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