CVE-2026-87910
tarfile hardlink fallback ignores custom extraction filter rejection via None
Description
When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.
No summary for this CVE yet.
Weaknesses
Affected Products
Python Software Foundation
oss-project·USaka psf
Exploitability
No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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MITRE ATT&CK
2 techniques Collection
Discovery
References
https://mail.python.org/archives/list/security-announce@python.org/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/
mail.python.org
https://github.com/python/cpython/pull/157266
github.com
https://github.com/python/cpython/issues/157265
github.com
and 4 more references View all →
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