Pylint: Arbitrary code execution via pickle deserialization of the stats cache in PYLINT_HOME

Pylint is a static code analyser for Python. From 0.15.2 until 4.0.9, Pylint stores module statistics in predictable files under PYLINT_HOME and loads those files with pickle.load on a later run. An attacker who can write to a shared, group-writable, or otherwise untrusted cache directory can replace a stats cache with crafted serialized data, causing arbitrary code to execute with the privileges of the user who next runs Pylint. The default per-user cache is not normally writable by another user. This issue is fixed in version 4.0.9.

Source published

22 Oct 2026 16:50:02 UTC

Source modified

22 Oct 2026 16:50:02 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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CVSS 4.0 · 5.4 CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N