{"id":"CVE-2026-89011","title":"isomorphic-git < 1.42.0 Prototype Pollution via getRemoteInfo","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 crafted ref names containing '__proto__' path …","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N","cvssSource":"cna","cwe":["CWE-1321"],"vendor":"isomorphic-git","product":"isomorphic-git","affected":["isomorphic-git < 1.42.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-11T17:09:25.363378Z"},"published":"2026-09-10","updated":"2026-09-11","sourceUpdated":"2026-09-11T20:32:36.479Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89011","references":[{"url":"https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-83vg-jxvh-fx76","label":"GitHub Security Advisory (GHSA-83vg-jxvh-fx76)"},{"url":"https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.42.0","label":"Release Notes"},{"url":"https://github.com/isomorphic-git/isomorphic-git/pull/2426","label":"Pull Request"},{"url":"https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/isomorphic-git-prototype-pollution-via-getremoteinfo"}],"tags":["cve.org"],"epss":0.00264,"epssPercentile":0.18596,"ingestedAt":"2026-09-14T11:11:19.881Z","slug":"CVE-2026-89011","body":"## Overview\n\nisomorphic-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.\n\n## Affected\n\n- `isomorphic-git < 1.42.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}