Brotli decoder flaw hits Node.js
A fixed out-of-bounds write bug in Google's Brotli decompression library, used by Node.js, could allow DoS, data leaks or remote code execution.
Sourceadvisories.ncsc.nl — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-111497 as exploited in the wild.
NCSC-NL published an advisory describing a vulnerability in Google's Brotli decompression library, which is bundled in Node.js and other software (including Debian packages). The flaw is an out-of-bounds write combined with an unchecked return value, and can be triggered remotely and without authentication by having the affected process decompress specially crafted Brotli-compressed data.
Successful exploitation could result in denial-of-service, disclosure of sensitive data from process memory, or arbitrary code execution with the privileges of the affected process. Google and the Node.js project have released patched versions addressing the issue. The advisory does not indicate any evidence of in-the-wild exploitation; this is a standard patch notification.
Defenders should identify any Node.js deployments, Debian packages, or other software bundling the Brotli library and apply the vendor-supplied updates. Because Brotli is widely embedded in web servers, CDNs, and language runtimes, affected software may extend beyond Node.js itself, so inventory of dependencies is recommended.
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0453.html
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