Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)

Date Oct 22, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · Pillow

CVE CVE-2026-96644

High-risk advisory CVE-2026-96644

Summary

Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)

Why it matters

GitHub has published a reviewed security advisory for Pillow. Prioritize it with other application dependency updates, especially because EPSS places it in the 25% percentile.

Operator check

Check whether Pillow is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 7.1. EPSS probability: 0.3%; percentile: 25%.

Sources

GitHub Advisory GHSA-9v9v-9qvf-h2hj NVD — CVE-2026-96644 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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