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

• CWE-835

• https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
• https://github.com/python/cpython/commit/57f5981d6260ed21266e0c26951b8564cc252bc2
• https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38
• https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19
• https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cb
• 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/
• http://www.openwall.com/lists/oss-security/2025/07/28/1
• http://www.openwall.com/lists/oss-security/2025/07/28/2

Published

Jul 28, 2025

Last Modified

Jul 31, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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