Out-of-bounds write in Node.js - CVE-2026-111497

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Main Vulnerability Database Vulnerabilities #VU157671

Out-of-bounds write in Node.js - CVE-2026-111497

Published: October 26, 2026


Vulnerability identifier: #VU157671
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-111497
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to corrupt process memory, potentially execute arbitrary code, disclose process memory, or cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the Brotli decoder bundled with Node.js when an invalid block switch is treated as a temporary need for input rather than a permanent format error. A remote attacker can supply malformed Brotli data that an application decompresses with node:zlib to make the streaming decoder append bytes beyond an eight-byte internal buffer, potentially causing code execution, process memory disclosure, or a crash.


Affected software

Node.js
Debian Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
perl-Alien-Brotli
brotli (Red Hat package)
brotli
mingw-qt5-qtwebkit
brotli (Debian package)

How to mitigate CVE-2026-111497

Install security update from vendor's website.

Node.js - addressed in versions 22.23.4, 24.22.1, 26.12.1
perl-Alien-Brotli - update to 0.2.2-15.fc45
brotli (Red Hat package) - addressed in versions 1.0.6-5.el8_10, 1.0.9-10.el9_8.1, 1.1.0-8.el10_2.1
brotli - update to 1.2.1-1.fc45
mingw-qt5-qtwebkit - addressed in versions 5.212.0-0.46.alpha4.fc44, 5.212.0-0.46.alpha4.fc45
brotli (Debian package) - update to 1.1.0-2+deb13u1

External References

Related Security Bulletins