{"id":"CVE-2020-15093","aliases":["GHSA-5q2r-92f9-4m49","RUSTSEC-2020-0024"],"url":"https://o3.security/vulnerability/CVE-2020-15093","summary":"Improper verification of signature threshold in tough","details":"The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. A fix is available in version 0.7.1. CVE-2020-6174 is assigned to the same vulnerability in the TUF reference implementation.","published":"2020-07-09T19:15:11.413Z","modified":"2026-07-09T10:52:48.810088Z","cvss":{"score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"tough","fixedVersion":"0.7.1"}],"fix":{"url":"https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e","label":"theupdateframework/tuf@2977188"},"references":[{"type":"ADVISORY","url":"https://crates.io/crates/tough"},{"type":"ADVISORY","url":"https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49"},{"type":"FIX","url":"https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e"},{"type":"FIX","url":"https://github.com/theupdateframework/tuf/pull/974"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T10:52:48.810088Z"}}