CVE-2026-11940 | 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 pointin
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.
- 🔗 github.com/python/cpython/pull/151559
- 🔗 mail.python.org/archives/list/[email protected]…
- 🔗 github.com/python/cpython/issues/151558
- 🔗 github.com/python/cpython/commit/27dd970bf6b17ebca7c…
- 🔗 github.com/python/cpython/commit/672825e2f36a57e1739…
- 🔗 github.com/python/cpython/commit/771d12dda5140313db0…
- 🔗 github.com/python/cpython/commit/79c06bd5c6afa3c440d…
- 🔗 github.com/python/cpython/commit/be13e86f6b9788a6f4d…
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CVE-2026-11940 | 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 pointin
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 ar