ghsa-v594-44hm-2j7p
Vulnerability from github
Published
2025-07-28 21:31
Modified
2025-08-07 21:31
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details

There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives.

This vulnerability can be mitigated by including the following patch after importing the “tarfile” module:

import tarfile

def _block_patched(self, count):     if count < 0: # pragma: no cover         raise tarfile.InvalidHeaderError("invalid offset")     return _block_patched._orig_block(self, count)

_block_patched._orig_block = tarfile.TarInfo._block tarfile.TarInfo._block = _block_patched

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-8194"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-28T19:15:43Z",
    "severity": "HIGH"
  },
  "details": "There is a defect in the CPython \u201ctarfile\u201d module affecting the \u201cTarFile\u201d extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. \n\nThis vulnerability can be mitigated by including the following patch after importing the \u201ctarfile\u201d module:\n\n\n\nimport tarfile\n\ndef _block_patched(self, count):\n\u00a0 \u00a0 if count \u003c 0:  # pragma: no cover\n\u00a0 \u00a0 \u00a0 \u00a0 raise tarfile.InvalidHeaderError(\"invalid offset\")\n\u00a0 \u00a0 return _block_patched._orig_block(self, count)\n\n_block_patched._orig_block = tarfile.TarInfo._block\ntarfile.TarInfo._block = _block_patched",
  "id": "GHSA-v594-44hm-2j7p",
  "modified": "2025-08-07T21:31:05Z",
  "published": "2025-07-28T21:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-8194"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/130577"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/137027"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.