CVE-2026-7774: Python Software Foundation Cpython

Medium severity, CVSS 6.9. EPSS: 0.8% chance of exploitation in the next 30 days.

tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.

Affected products

• Python Software Foundation Cpython: before 3.10.21 (fixed in 3.10.21); from 3.11.0, before 3.11.16 (fixed in 3.11.16); from 3.12.0, before 3.12.14 (fixed in 3.12.14); from 3.13.0, before 3.13.14 (fixed in 3.13.14); from 3.14.0, before 3.14.6 (fixed in 3.14.6); from 3.15.0a1, before 3.15.0b2 (fixed in 3.15.0b2)

Published 2026-06-04. Last modified 2026-08-13.