CVE-2026-11972

Details

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.

Affected Packages

Python

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1703)Windows 10 (1709)Windows 10 (1803)

Fixed in:

3.10.213.11.163.12.143.13.153.14.73.15.0b4

References

FIX

https://github.com/python/cpython/commit/3f031d431f80668e14f3bc066bbf4369cd9281b9

FIX

https://github.com/python/cpython/commit/4ce6bf7c8aa7725828a38981c306f214c1f29365

FIX

https://github.com/python/cpython/commit/7f0dc59c9a70f8f3b4da33d7c4a2ba552a7acc21

FIX

https://github.com/python/cpython/commit/e86666c9dd256d52d0fbef6feb1ea4a51768fdec

FIX

https://github.com/python/cpython/commit/eb63c0f94dfcbea7fda8eab6213818e134d67192

FIX

https://github.com/python/cpython/commit/f50bf13566189c8d0ce5a814f33eff3d89951896

FIX

https://github.com/python/cpython/commit/f5e2776ff0383a902c12acf2b703e7e951fc8438

WEB

https://github.com/python/cpython/issues/151981

FIX

https://github.com/python/cpython/pull/151982

ADVISORY

https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-11972