GHSA-V594-44HM-2J7P

Vulnerability from github – Published: 2025-07-28 21:31 – Updated: 2025-11-05 00:31
VLAI?
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

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "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": "2025-11-05T00:31:23Z",
  "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/57f5981d6260ed21266e0c26951b8564cc252bc2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cb"
    },
    {
      "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"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2025/07/28/1"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2025/07/28/2"
    }
  ],
  "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"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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