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Werk #22239: Update Windows agent Python runtime to 3.13.15

Component Agent bakery
Title Update Windows agent Python runtime to 3.13.15
Date Sep 3, 2026
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.5.0p14 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p37 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The Checkmk Windows agent bundles its own Python runtime. That runtime now ships 3.13.15.

The release addresses issues in tarfile (a bypass of CVE-2025-4330) and http.client (GHSA-w4q2-g22w-6fr4), and updates the bundled libexpat to 2.8.2.

None of these flaws affect Checkmk directly. Updating the runtime reduces the scope of an attack against the agent.

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