CVE-2026-82049

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://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca
• https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3
• https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d
• https://github.com/python/cpython/issues/157190
• https://github.com/python/cpython/pull/157191
• https://mail.python.org/archives/list/security-announce@python.org/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/
• http://www.openwall.com/lists/oss-security/2026/09/14/27