GHSA-9v8h-qqgm-4m35: Brotli: Out-of-bounds write in the Brotli decoder ("Node2Shell") also affects the PyPI Brotli package
(updated )
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
- broccoli2shell.com/
- cert-portal.siemens.com/productcert/html/ssa-045512.html
- cert-portal.siemens.com/productcert/html/ssa-443410.html
- cert-portal.siemens.com/productcert/html/ssa-898633.html
- ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds
- github.com/advisories/GHSA-9v8h-qqgm-4m35
- github.com/andybalholm/brotli/releases/tag/v1.2.7
- github.com/dotnet/announcements/issues/494
- github.com/google/brotli/commit/0ed4268a4401abcb4472096340477cf4af7d1a2b
- github.com/google/brotli/commit/50a9b70a4d5e1443fc40927952276b68fffa83a0
- github.com/google/brotli/commit/b418fa81c48262a86a95332b0bc6d62c30aa78b6
- github.com/google/brotli/commit/da9806362874b9bd4b552a3af360b5d6347beb12
- github.com/google/brotli/releases/tag/v1.0.10
- github.com/google/brotli/releases/tag/v1.1.1
- github.com/google/brotli/releases/tag/v1.2.1
- github.com/pypa/advisory-database/tree/main/vulns/brotli/PYSEC-2026-4322.yaml
- github.com/pypa/advisory-database/tree/main/vulns/brotlicffi/PYSEC-2026-4323.yaml
- lists.debian.org/debian-lts-announce/2026/10/msg00049.html
- nodejs.org/en/blog/vulnerability/october-2026-security-releases
- nodejs.org/en/blog/vulnerability/october-2026-security-releases
- nvd.nist.gov/vuln/detail/CVE-2026-111497
- opensourcemalware.com/blog/node2shell-affects-python
- patchtheplanet.org/brotli
- pypi.org/project/Brotli
- pypi.org/project/brotlicffi
- www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497
- www.cve.org/CVERecord?id=CVE-2026-111497
Code Behaviors & Features
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