{"id":"CVE-2026-89011","title":"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 …","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","cwe":["CWE-1321","CWE-915"],"vendor":"isomorphic-git","product":"isomorphic-git","affected":["isomorphic-git < 1.42.0"],"published":"2026-09-10","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:17:46.310","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89011","references":[{"url":"https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb","label":"disclosure@vulncheck.com"},{"url":"https://github.com/isomorphic-git/isomorphic-git/pull/2426","label":"disclosure@vulncheck.com"},{"url":"https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.42.0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-83vg-jxvh-fx76","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/isomorphic-git-prototype-pollution-via-getremoteinfo","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89011.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89011"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531620"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89011"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89011"},{"url":"https://access.redhat.com/errata/RHSA-2026:72712"},{"url":"https://access.redhat.com/errata/RHSA-2026:72722"},{"url":"https://access.redhat.com/errata/RHSA-2026:88200"},{"url":"https://access.redhat.com/errata/RHSA-2026:76788"},{"url":"https://access.redhat.com/errata/RHSA-2026:79088"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00443,"epssPercentile":0.38305,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-11T17:09:25.363378Z"},"ingestedAt":"2026-09-14T11:11:19.881Z","patched":["ansible_automation_platform 2.1","ansible_automation_platform 2.2"],"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## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:72712** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.1 · released 2026-09-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:72712)\n- **RHSA-2026:72722** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-09-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:72722)\n- **Red Hat VEX** · Important · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89011.json)\n- **RHSA-2026:88200** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88200)\n- **RHSA-2026:76788** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76788)\n- **RHSA-2026:79088** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79088)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}