{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.7.8"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4676ac05b1056b54a3d38d03ae8a478bf12c9abe"
            },
            {
              "fixed": "899c8fe2d3ceb25d899e70dbd0c7744b7d7a0946"
            }
          ],
          "repo": "https://github.com/midnightbsd/mport",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-23g3-7fv3-3ccf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-367",
      "CWE-59"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54576.json"
  },
  "details": "mport is the MidnightBSD Package Manager. Prior to 2.7.8, do_actual_install() in libmport/bundle_read_install_pkg.c used path-based lstat(), chown(), stat(), and chmod() operations while installing package files. A local attacker with write access to a target directory could replace a checked file with a symlink before privileged ownership or mode changes were applied, redirecting those changes to an attacker-selected path and compromising filesystem integrity or permissions. This issue is fixed in version 2.7.8.",
  "id": "CVE-2026-54576",
  "modified": "2026-09-19T03:30:39.009091408Z",
  "published": "2026-09-17T16:58:25.028Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MidnightBSD/mport/releases/tag/2.7.8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54576.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/MidnightBSD/mport/security/advisories/GHSA-23g3-7fv3-3ccf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54576"
    },
    {
      "type": "FIX",
      "url": "https://github.com/MidnightBSD/mport/commit/4676ac05b1056b54a3d38d03ae8a478bf12c9abe"
    },
    {
      "type": "FIX",
      "url": "https://github.com/MidnightBSD/mport/pull/150"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "mport package installation has symlink TOCTOU in chown and chmod handling"
}