{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.42.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f6746a642a964d45b003fe695ac37712d494350f"
            },
            {
              "fixed": "b3db111885230bac9a648e0a2312c65ca66f76eb"
            }
          ],
          "repo": "https://github.com/isomorphic-git/isomorphic-git",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-83vg-jxvh-fx76"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89011.json"
  },
  "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.",
  "id": "CVE-2026-89011",
  "modified": "2026-09-13T03:31:01.820436933Z",
  "published": "2026-09-10T19:56:25.335Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89011.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.42.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-83vg-jxvh-fx76"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89011"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/isomorphic-git-prototype-pollution-via-getremoteinfo"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/isomorphic-git/isomorphic-git/pull/2426"
    },
    {
      "type": "FIX",
      "url": "https://github.com/isomorphic-git/isomorphic-git/commit/b3db111885230bac9a648e0a2312c65ca66f76eb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/isomorphic-git/isomorphic-git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "isomorphic-git \u003c 1.42.0 Prototype Pollution via getRemoteInfo"
}