{"id":"GHSA-794x-2rpg-rfgr","aliases":[],"url":"https://o3.security/vulnerability/GHSA-794x-2rpg-rfgr","summary":"Jujutsu does not have SHA-1 collision detection","details":"### Summary\nJujutsu 0.28.0 and earlier rely on versions of gitoxide that use SHA-1 hash implementations without any collision detection, leaving them vulnerable to hash collision attacks.\n\n### Details\nThis is a result of the underlying [CVE-2025-31130 / GHSA-2frx-2596-x5r6](https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-2frx-2596-x5r6) vulnerability in the gitoxide library Jujutsu uses to interact with Git repositories; see that advisory for technical details. This separate advisory is being issued due to the downstream impact on users of Jujutsu.\n\n### Impact\nAn attacker with the ability to mount a collision attack on SHA-1 like the [SHAttered](https://shattered.io/) or [SHA-1 is a Shambles](https://sha-mbles.github.io/) attacks could create two distinct Git objects with the same hash. This is becoming increasingly affordable for well‐resourced attackers, with the Shambles researchers in 2020 estimating $45k for a chosen‐prefix collision or $11k for a classical collision, and projecting less than $10k for a chosen‐prefix collision by 2025. The result could be used to disguise malicious repository contents, or potentially exploit assumptions in Jujutsu’s logic to cause further vulnerabilities.","published":"2025-04-07T16:40:25Z","modified":"2025-04-07T16:40:25Z","cvss":{"score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"jj-lib","fixedVersion":"0.28.1"},{"ecosystem":"crates.io","name":"jj-cli","fixedVersion":"0.28.1"}],"fix":{"url":"https://github.com/jj-vcs/jj/commit/350da7d013773377aec0d3a4bf4374d3c941460e","label":"jj-vcs/jj@350da7d"},"references":[{"type":"WEB","url":"https://github.com/jj-vcs/jj/security/advisories/GHSA-794x-2rpg-rfgr"},{"type":"WEB","url":"https://github.com/jj-vcs/jj/commit/350da7d013773377aec0d3a4bf4374d3c941460e"},{"type":"PACKAGE","url":"https://github.com/jj-vcs/jj"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2025-04-07T16:40:25Z"}}