Brotli: Out-of-bounds write in the Brotli decoder ("Node2Shell") also affects the PyPI Brotli package
GHSA-9v8h-qqgm-4m35 · BIT-node-2026-111497 · BIT-node-min-2026-111497 · CVE-2026-111497 · PYSEC-2026-4322 · PYSEC-2026-4323
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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.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-111497
- WEB 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
- PACKAGE https://github.com/google/brotli
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