{"id":"CVE-2026-89011","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89011","summary":"isomorphic-git before 1.42.0 contains a prototype pollution vulnerability in the getRemoteInfo function that allows a malicious Git server operator to pollute Object.prototype by advertising…","details":"isomorphic-git before 1.42.0 contains a prototype pollution vulnerability in the getRemoteInfo function that allows a malicious Git server operator to pollute Object.prototype by advertising crafted ref names containing '__proto__' path segments during ref negotiation. Attackers controlling a Git server can advertise a specially crafted ref such as '__proto__/corsProxy' to reroute all subsequent network operations through an attacker-controlled proxy, causing isomorphic-git to invoke the victim's onAuth callback and transmit credentials to the attacker when the victim calls getRemoteInfo with an attacker-supplied URL.","published":"2026-09-10T20:17:31.833","modified":"2026-09-10T20:17:31.833","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb","label":"isomorphic-git/isomorphic-git@b3db111"},"references":[{"type":"WEB","url":"https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb"},{"type":"WEB","url":"https://github.com/isomorphic-git/isomorphic-git/pull/2426"},{"type":"WEB","url":"https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.42.0"},{"type":"WEB","url":"https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-83vg-jxvh-fx76"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/isomorphic-git-prototype-pollution-via-getremoteinfo"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T20:17:31.833"}}