---
id: CVE-2026-111497
title: Out-of-Bounds Write in Google Brotli Decoder
summary: >-
  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 m…
severity: critical
cvss: 9.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-787
  - CWE-252
vendor: Google
product: github.com/google/brotli
affected:
  - github.com/google/brotli >= 1.0.3 < 1.0.10
  - github.com/google/brotli >= 1.1.0 < 1.1.1
  - github.com/google/brotli >= 1.2.0 < 1.2.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-22T14:15:10.861688Z'
exploitAvailable: true
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:00:32.358Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111497'
references:
  - url: >-
      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
tags:
  - cve.org
  - exploit-available
exploits:
  github: 9
  githubRepos:
    - 'https://github.com/CaterMaoZi/CVE-2026-111497-POC'
    - 'https://github.com/dimasma0305/CVE-2026-111497-POC'
    - 'https://github.com/Sami-AlEsh/nodejs-security-check'
  checkedAt: '2026-10-22T22:01:26.501Z'
ingestedAt: '2026-10-22T22:00:50.377Z'
---

## Overview

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

- `github.com/google/brotli >= 1.0.3 < 1.0.10`
- `github.com/google/brotli >= 1.1.0 < 1.1.1`
- `github.com/google/brotli >= 1.2.0 < 1.2.1`

## Remediation

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.