Vulnerability from bitnami_vulndb
Published
2026-09-21 09:00
Modified
2026-10-13 07:22
Summary
tarfile extraction filters allow file modification and content disclosure via hard link to symlink
Details

In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "libpython",
        "purl": "pkg:bitnami/libpython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.10.22"
            },
            {
              "introduced": "3.11.0"
            },
            {
              "fixed": "3.11.17"
            },
            {
              "introduced": "3.12.0"
            },
            {
              "fixed": "3.12.15"
            },
            {
              "introduced": "3.13.0"
            },
            {
              "fixed": "3.13.16"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-82049"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "In CPython 3.13 and earlier, the tarfile module\u0027s data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.",
  "id": "BIT-libpython-2026-82049",
  "modified": "2026-10-13T07:22:07.779Z",
  "published": "2026-09-21T09:00:11.991Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/14/27"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/157190"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/157191"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82049"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/197663d63afed27f66e10e23c194e8a634e60913"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/28f315486b3da0352b9a1de1c3c97f4127ba4771"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/c66df4e70435d257fd488b35ea129c6f317433a8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/cc1689830c6b9aaddded2fb9f2fe8116867e2c0e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/cccc7ec30212dba2abef53ce4a2bed112ddb690c"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "tarfile extraction filters allow file modification and content disclosure via hard link to symlink"
}



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