CVE-2026-111497
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.
- Score
- CVSS 3.1 9.8 Critical
- Status
- Analyzed - cve-coordination@google.com
- Published
- 2026-10-22
- Last modified
- 2026-10-28
- Known exploited (CISA KEV)
- since 2026-10-27, action due 2026-11-10: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Weaknesses
- CWE-252, CWE-787
Affected products
- P7zip (7-zip)
- Brotli (Andybalholm)
- Bun (Anthropic)
- Arrow (Apache)
- Clickhouse (Clickhouse)
- Debian Linux (Debian)
- Duckdb (Duckdb)
- Envoy (Envoyproxy)
- Brotli (Google)
- Woff2 (Google)
- Istio (Istio)
- 7-zip-zstd (Mcmilk)
- .net (Microsoft)
- Node.js (Nodejs)
- Brotlicffi (Python-hyper)
- Edk2 (Tianocore)
References
- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permi…
- https://github.com/andybalholm/brotli/releases/tag/v1.2.7
- https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497
- https://github.com/advisories/GHSA-9v8h-qqgm-4m35
- http://www.openwall.com/lists/oss-security/2026/10/23/25
- https://lists.debian.org/debian-lts-announce/2026/10/msg00049.html
- http://www.openwall.com/lists/oss-security/2026/10/24/6
- http://www.openwall.com/lists/oss-security/2026/10/26/12
- http://www.openwall.com/lists/oss-security/2026/10/26/13
- https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
- https://broccoli2shell.com
- https://github.com/dotnet/announcements/issues/494
- https://github.com/google/brotli/releases/tag/v1.2.1
- https://github.com/google/brotli/releases/tag/v1.1.1
- https://github.com/google/brotli/releases/tag/v1.0.10
- https://patchtheplanet.org/brotli
- http://www.openwall.com/lists/oss-security/2026/10/26/16
