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CVE-2025-8194 – Apache CPython TarFile Infinite Loop Deadlock

The following table lists the changes that have been made to the
CVE-2025-8194 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • CVE Modified
    by [email protected]

    Jul. 28, 2025

    Action Type Old Value New Value
    Added Reference https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38
    Added Reference https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe
  • New CVE Received
    by [email protected]

    Jul. 28, 2025

    Action Type Old Value New Value
    Added Description 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
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-835
    Added Reference https://github.com/python/cpython/issues/130577
    Added Reference https://github.com/python/cpython/pull/137027
    Added Reference https://mail.python.org/archives/list/[email protected]/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/
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