CVE-2025-8194
Tarfile infinite loop during parsing with negative member offset
- State
- Published
- Severity
- 7.5 High
- Published
- Jul 28, 2025
- Updated
- Jul 31, 2026
- Reserved
- Jul 25, 2025
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | PSF |
Weaknesses
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Products
| Product | Versions |
|---|---|
CPythonPython Software Foundation |
|
References
- https://github.com/python/cpython/issues/130577issue-tracking
- https://github.com/python/cpython/pull/137027patch
- https://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/vendor-advisory
- https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38patch
- https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fepatch
- https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1mitigation
- https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29fpatch
- https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227patch
- https://github.com/python/cpython/commit/57f5981d6260ed21266e0c26951b8564cc252bc2patch
- https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19patch
- https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cbpatch
- http://www.openwall.com/lists/oss-security/2025/07/28/1
- http://www.openwall.com/lists/oss-security/2025/07/28/2
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