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.

• 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://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

• UNSCOREDCVE-2026-56388
• MEDIUMCVE-2017-20283
• HIGHCVE-2017-20286PoC
• MEDIUMCVE-2020-37286PoC
• HIGHCVE-2021-48018PoC
• MEDIUMCVE-2021-48020PoC
• UNSCOREDCVE-2025-58773
• MEDIUMCVE-2025-60494PoC

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