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AIKIDO-2026-657870

brotli is vulnerable to Out-of-bounds Write

CVE-2026-111497Published 3 days ago
November 6, 2026

95

CVE Score

Critical

Out-of-bounds Write

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TL;DR

The bundled Brotli decoder fails to reject invalid block switches when a stream declares only one block type. Decoding continues with inconsistent state and can write outside allocated memory. Crafted input can crash the process, expose memory, or potentially execute code.

How do I fix this?

Upgrade brotli to 0.3.4 or later and rebuild the native module. This updates the bundled decoder to Brotli 1.2.1 with the fix.

Who does this affect?

You are affected if you pass untrusted Brotli data to brotli:decode/1 or the streaming decoder. The native decoder runs inside the VM, so a crash can take down the entire application.

Package

brotli

Versions

0.3.0 - 0.3.3

Fixed in 0.3.4

Background info

brotli is vulnerable to Out-of-bounds Write in versions 0.3.0 - 0.3.3.

Links

Other

nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high
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
openwall.com/lists/oss-security/2026/10/23/25
http://www.openwall.com/lists/oss-security/2026/10/23/25
openwall.com/lists/oss-security/2026/10/24/6
http://www.openwall.com/lists/oss-security/2026/10/24/6
openwall.com/lists/oss-security/2026/10/26/12
http://www.openwall.com/lists/oss-security/2026/10/26/12
openwall.com/lists/oss-security/2026/10/26/13
http://www.openwall.com/lists/oss-security/2026/10/26/13
openwall.com/lists/oss-security/2026/10/26/16
http://www.openwall.com/lists/oss-security/2026/10/26/16
openwall.com/lists/oss-security/2026/11/03/2
http://www.openwall.com/lists/oss-security/2026/11/03/2
broccoli2shell.com
https://broccoli2shell.com
lists.debian.org/debian-lts-announce/2026/10/msg00049.html
https://lists.debian.org/debian-lts-announce/2026/10/msg00049.html
patchtheplanet.org/brotli
https://patchtheplanet.org/brotli
aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
cert-portal.siemens.com/productcert/html/ssa-045512.html
https://cert-portal.siemens.com/productcert/html/ssa-045512.html
cert-portal.siemens.com/productcert/html/ssa-443410.html
https://cert-portal.siemens.com/productcert/html/ssa-443410.html
cert-portal.siemens.com/productcert/html/ssa-898633.html
https://cert-portal.siemens.com/productcert/html/ssa-898633.html
ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/
https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497

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