BIT-python-min-2026-114583

Dashboard / Vulnerabilities / BIT-python-min-2026-114583

BIT-python-min-2026-114583

Summary: tar filter allows writing outside destination via empty-named symlink

Details: tarfile.tar_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() with filter="tar" to write files outside the destination directory, subject to the permissions of the extracting process. This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter.

References: https://github.com/python/cpython/commit/04d8fca7da2cf3ebc0881fec8a53a1330c3b665d, https://github.com/python/cpython/commit/0901ad4ffb22605f12b705d1c1197f0a01f0ba0b, https://github.com/python/cpython/commit/bc93f8ad4c4a0f92d184ec8fccc8ff8a651dcec2, https://github.com/python/cpython/commit/c6ada40177436e4e2533a7b252082b5f0c043477, https://github.com/python/cpython/commit/e7e0b3523ad6ba8472873dda594cf4021a16f8b5, https://github.com/python/cpython/commit/f4401da82e2baec5dab06cf070fbca77d53220f0, https://github.com/python/cpython/issues/160097, https://github.com/python/cpython/pull/160098, https://mail.python.org/archives/list/[email protected]/thread/43JOWPRAV5DI3VZ4FUEUAZOHCATXXOCK/, https://nvd.nist.gov/vuln/detail/CVE-2026-114583