CVE-2026-4360

low

Description

In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.

References

https://mail.python.org/archives/list/[email protected]/thread/TWZW2PC2AZOV6FENIHFSRC63OM7MBGSB/

https://github.com/python/cpython/pull/151988

https://github.com/python/cpython/issues/151987

https://github.com/python/cpython/commit/eee3ddf0ca10283cc7fea724aae9cd8665f8d15e

https://github.com/python/cpython/commit/7ccdbaba2c54250a70d7f25632152df7655a5e0a

https://github.com/python/cpython/commit/7b57e8d51446297b8c7c482d224bc5f1938e4301

https://github.com/python/cpython/commit/5e0ef3f1afe892e4f64eb83368db57ac4c40cba0

Details

Source: Mitre, NVD

Published: 2026-06-30

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: 9.1

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

Severity: Critical

CVSS v4

Base Score: 2

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

Severity: Low