CVE-2025-8194

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: https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38
https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f
https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe
https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227
https://github.com/python/cpython/issues/130577
https://github.com/python/cpython/pull/137027
https://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/

Configurations

No configuration.

History

07 Aug 2025, 21:15

Type	Values Removed	Values Added
References		() https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f - () https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227 -

29 Jul 2025, 14:15

Type	Values Removed	Values Added
References		() https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1 -
Summary		(es) Existe un defecto en el módulo "tarfile" de CPython que afecta a las API de extracción y enumeración de entradas de "TarFile". La implementación de tar procesaba archivos tar con desplazamientos negativos sin errores, lo que resultaba en un bucle infinito y un bloqueo durante el análisis de archivos tar manipulados con fines maliciosos. Esta vulnerabilidad se puede mitigar incluyendo el siguiente parche después de importar el módulo "tarfile": 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
Summary	(en) 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	(en) 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: https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1

28 Jul 2025, 20:17

Type	Values Removed	Values Added
References		() https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38 - () https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe -

28 Jul 2025, 19:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-07-28 19:15

Updated : 2025-08-07 21:15

NVD link : CVE-2025-8194

Mitre link : CVE-2025-8194

CVE.ORG link : CVE-2025-8194

JSON object : View

Products Affected

No product.

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

7.5 /10