{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"isomorphic-git/isomorphic-git","product":"isomorphic-git","source":"CNA: VulnCheck","vendor":"isomorphic-git","versions":[{"lessThan":"1.42.0","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-89011","cwes":["CWE-1321"],"description":"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.","epss":{"date":"2026-11-08","percentile":0.38744,"score":0.00443},"exploits":[],"kev":null,"metrics":[{"score":7.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N","version":"3.1"}],"modifiedAt":1794146959711,"publishedAt":1789070185335,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-83vg-jxvh-fx76"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.42.0"},{"source":"CNA: VulnCheck","tags":["issue-tracking","patch"],"url":"https://github.com/isomorphic-git/isomorphic-git/pull/2426"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/isomorphic-git-prototype-pollution-via-getremoteinfo"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/isomorphic-git/isomorphic-git/pull/2426"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb"}],"revision":"0a62a9e77b412aa869e67ef6ce02df3940c01d82a752fbab476bcf6cb59a89a3","sources":[{"modifiedAt":1794146959711,"name":"CNA: VulnCheck","retrievedAt":1794151402557,"url":"https://www.cve.org/CVERecord?id=CVE-2026-89011"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794151407994,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-89011"}],"ssvc":{"assessedAt":1789146565363,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"isomorphic-git < 1.42.0 Prototype Pollution via getRemoteInfo","updatedAt":1794151407994}