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.

Weakness

The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.

Affected Software

Potential Mitigations

References

• https://github.com/andybalholm/brotli/releases/tag/v1.2.7
• 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
• http://www.openwall.com/lists/oss-security/2026/10/23/25
• 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
• http://www.openwall.com/lists/oss-security/2026/10/26/16
• https://broccoli2shell.com
• https://github.com/advisories/GHSA-9v8h-qqgm-4m35
• https://github.com/dotnet/announcements/issues/494
• https://github.com/google/brotli/releases/tag/v1.0.10
• https://github.com/google/brotli/releases/tag/v1.1.1
• https://github.com/google/brotli/releases/tag/v1.2.1
• https://lists.debian.org/debian-lts-announce/2026/10/msg00049.html
• https://patchtheplanet.org/brotli
• https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
• 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