CVE-2026-82049

high

Description

In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.

References

https://mail.python.org/archives/list/[email protected]/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/

https://github.com/python/cpython/pull/157191

https://github.com/python/cpython/issues/157190

https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d

https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3

https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca

http://www.openwall.com/lists/oss-security/2026/09/14/27

Details

Source: Mitre, NVD

Published: 2026-09-14

Updated: 2026-09-16

Risk Information

CVSS v2

Base Score: 1.9

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

Severity: Low

CVSS v3

Base Score: 5

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

Severity: Medium

CVSS v4

Base Score: 8.4

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

Severity: High

EPSS

EPSS: 0.00182