CVE-2026-11972

high

Description

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.

References

https://mail.python.org/archives/list/[email protected]/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/

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

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

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

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

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

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

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

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

Details

Source: Mitre, NVD

Published: 2026-06-23

Updated: 2026-06-30

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 8.2

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N