Description
tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory. This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Python Software Foundation CPython
Default version status: unaffected
0 to < 3.10.21affected3.11.0 to < 3.11.16affected3.12.0 to < 3.12.14affected3.13.0 to < 3.13.15affected3.14.0 to < 3.14.7affected3.15.0a1 to < 3.15.0b4affected
References
- https://github.com/python/cpython/pull/151559 ↗
- https://mail.python.org/archives/list/security-announce@python.org/thread/LD6QIISNQFQYOIEPJNEUIPV7S3V76FZH/ ↗
- https://github.com/python/cpython/issues/151558 ↗
- https://github.com/python/cpython/commit/27dd970bf6b17ebca7c8ed486a40ab043ed7af8f ↗
- https://github.com/python/cpython/commit/672825e2f36a57e173959b0d9d409d4560dab8df ↗
- https://github.com/python/cpython/commit/771d12dda5140313db0ac550292987975651bbde ↗
- https://github.com/python/cpython/commit/79c06bd5c6afa3c440d50faf7ee1b147c8832b4c ↗
- https://github.com/python/cpython/commit/be13e86f6b9788a6f4d0419dffef72cbae5865c9 ↗
- https://github.com/python/cpython/commit/e5fdbd8d5aa923bd9111b112ea73bd6ec7c47877 ↗
- https://github.com/python/cpython/commit/0f852b3f07dd8e71e40326a51c02afbf16a42cc5 ↗