Brotli: Out-of-bounds write in the Brotli decoder ("Node2Shell") also affects the PyPI Brotli package

Date Oct 22, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product PyPI · brotli

Critical vendor advisory

Summary

Brotli: Out-of-bounds write in the Brotli decoder ("Node2Shell") also affects the PyPI Brotli package

Why it matters

GitHub has published a reviewed security advisory for brotli. Prioritize it with other application dependency updates.

Operator check

Check whether brotli is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.2.

Sources

GitHub Advisory GHSA-9v8h-qqgm-4m35 Source reference

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

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