CVE-2026-111497
Google Brotli
Published 22 Oct 2026 · updated 28 Oct 2026 · Undergoing Analysis
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 27 Oct 2026, with a remediation deadline of 10 Nov 2026 for US federal agencies.
Required action: 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.
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
- github.com/andybalholm/brotli/releases/tag/v1.2.7
- nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high
- www.openwall.com/lists/oss-security/2026/10/23/25
- www.openwall.com/lists/oss-security/2026/10/24/6
- www.openwall.com/lists/oss-security/2026/10/26/12
- www.openwall.com/lists/oss-security/2026/10/26/13
- www.openwall.com/lists/oss-security/2026/10/26/16
- broccoli2shell.com/
- github.com/advisories/GHSA-9v8h-qqgm-4m35
- github.com/dotnet/announcements/issues/494
- 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
- lists.debian.org/debian-lts-announce/2026/10/msg00049.html
- patchtheplanet.org/brotli
- www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
- ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497