GHSA-9v8h-qqgm-4m35#brotlicffi

Summary

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

Severity

critical

CWE

CWE-252

Published

2026-10-22

Updated

2026-10-23

Advisory details

A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream.

Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.

References

• https://github.com/advisories/GHSA-9v8h-qqgm-4m35
• https://nvd.nist.gov/vuln/detail/CVE-2026-111497
• https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high
• https://github.com/google/brotli/commit/0ed4268a4401abcb4472096340477cf4af7d1a2b
• https://github.com/google/brotli/commit/50a9b70a4d5e1443fc40927952276b68fffa83a0
• https://github.com/google/brotli/commit/b418fa81c48262a86a95332b0bc6d62c30aa78b6
• https://github.com/google/brotli/commit/da9806362874b9bd4b552a3af360b5d6347beb12
• https://github.com/google/brotli/releases/tag/v1.0.10

Related advisories

• GHSA-9v8h-qqgm-4m35#brotli — critical · PyPI/brotli
• CVE-2026-19534 — high · npm/undici
• WEB3-UNCHECKED-CALL-2016 — high · Web3 · Ethereum/Solidity low-level call/send/transfer
• GHSA-x9ff-22gv-65f4 — medium · Go/github.com/labstack/echo/v5
• CVE-2026-62909 — medium · NuGet/Microsoft.NETCore.App.Runtime.linux-arm
• CVE-2026-35339 — medium · crates.io/uu_chmod

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