GHSA-9v8h-qqgm-4m35

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

Description

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.

Affected packages

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-111497 ADVISORY
• https://github.com/google/brotli/commit/0ed4268a4401abcb4472096340477cf4af7d1a2b WEB
• https://github.com/google/brotli/commit/50a9b70a4d5e1443fc40927952276b68fffa83a0 WEB
• https://github.com/google/brotli/commit/b418fa81c48262a86a95332b0bc6d62c30aa78b6 WEB
• https://github.com/google/brotli/commit/da9806362874b9bd4b552a3af360b5d6347beb12 WEB
• https://www.cve.org/CVERecord?id=CVE-2026-111497 WEB
• https://pypi.org/project/brotlicffi WEB
• https://pypi.org/project/Brotli WEB
• https://opensourcemalware.com/blog/node2shell-affects-python WEB
• 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 WEB
• https://nodejs.org/en/blog/vulnerability/october-2026-security-releases WEB
• https://github.com/pypa/advisory-database/tree/main/vulns/brotlicffi/PYSEC-2026-4323.yaml WEB
• https://github.com/pypa/advisory-database/tree/main/vulns/brotli/PYSEC-2026-4322.yaml WEB
• https://github.com/google/brotli/releases/tag/v1.2.1 WEB
• https://github.com/google/brotli/releases/tag/v1.1.1 WEB
• https://github.com/google/brotli/releases/tag/v1.0.10 WEB
• https://github.com/google/brotli PACKAGE

Sources