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2.0 Low

CVE-2026-4360 In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks

Description

In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.

Affected products and versions

Product Affected versions Fixed in
CPython 3.15 3.15.0a1 → < 3.15.0b4 3.15.0b4
CPython 3.14 3.14.0 → < 3.14.7 3.14.7
CPython 3.13 3.13.0 → < 3.13.15 3.13.15
CPython 3.12 3.12.0 → < 3.12.14 3.12.14
CPython 3.11 3.11.0 → < 3.11.16 3.11.16
CPython 3.10 earliest → < 3.10.21 3.10.21

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