{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.24.0"
              },
              {
                "fixed": "1.2.5"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "031c690286ed5e6ddd199b4272587d590624b728"
            },
            {
              "fixed": "073f4dfa9840af2da59887ed828b026b609faa6c"
            }
          ],
          "repo": "https://github.com/jelmer/dulwich",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9277-mp7x-85jf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-78"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42563.json"
  },
  "details": "Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.24.0 and prior to version 1.2.5, Dulwich's `ProcessMergeDriver` substitutes the file path (from the git tree, controllable by an attacker via a malicious branch) into the merge driver command via the `%P` placeholder and executes it with `subprocess.run(..., shell=True)`. An attacker who can cause a victim to merge an untrusted branch can achieve arbitrary command execution by crafting malicious file paths. Version 1.2.5 fixes the issue.",
  "id": "CVE-2026-42563",
  "modified": "2026-08-04T11:30:58.872620146Z",
  "published": "2026-06-10T21:47:14.927Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42563.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/jelmer/dulwich/security/advisories/GHSA-9277-mp7x-85jf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42563"
    },
    {
      "type": "FIX",
      "url": "https://github.com/jelmer/dulwich/commit/e3331b3b3a122fc313460182f928f59723580b7b"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Dulwich Vulnerable to Command Injection via Merge Driver Path"
}