CVE-2026-7774
Severity CVSS v4.0:
MEDIUM
Type:
CWE-22
Path Traversal
Publication date:
04/06/2026
Last modified:
07/07/2026
Description
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.
Impact
Base Score 4.0
6.90
Severity 4.0
MEDIUM
References to Advisories, Solutions, and Tools
- https://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2
- https://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6d
- https://github.com/python/cpython/commit/10a13bee3c24f9c62b602e696334ff2272a40efc
- https://github.com/python/cpython/commit/578411982c16f753f4893532510099ef665117da
- https://github.com/python/cpython/commit/5cf47a248c35c375d610b87b2f72fd1ed454b558
- https://github.com/python/cpython/commit/74cca9a92fb7d653e404843a56b8bdc7b0afdbbf
- https://github.com/python/cpython/commit/c063191cb7f9170f9565e305f8aa2b79ab2bf609
- https://github.com/python/cpython/issues/149486
- https://github.com/python/cpython/pull/149487
- https://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/
- http://www.openwall.com/lists/oss-security/2026/06/04/9