CVE-2025-8194

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

PUBLISHED Reserved 2025-07-25 | Published 2025-07-28 | Updated 2025-11-04 | Assigner PSF

Problem types

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Product status

Credits

Alexander Urieles reporter

Seth Larson coordinator

Ethan Furman remediation reviewer

Steve Dower remediation reviewer

References

www.openwall.com/lists/oss-security/2025/07/28/1

www.openwall.com/lists/oss-security/2025/07/28/2

github.com/python/cpython/issues/130577 issue-tracking

github.com/python/cpython/pull/137027 patch

mail.python.org/.../thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/ vendor-advisory

github.com/...ommit/7040aa54f14676938970e10c5f74ea93cd56aa38 patch

github.com/...ommit/cdae923ffe187d6ef916c0f665a31249619193fe patch

gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1 mitigation

github.com/...ommit/c9d9f78feb1467e73fd29356c040bde1c104f29f patch

github.com/...ommit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227 patch

github.com/...ommit/57f5981d6260ed21266e0c26951b8564cc252bc2 patch

github.com/...ommit/73f03e4808206f71eb6b92c579505a220942ef19 patch

github.com/...ommit/b4ec17488eedec36d3c05fec127df71c0071f6cb patch

cve.org (CVE-2025-8194)

nvd.nist.gov (CVE-2025-8194)

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