Out-of-bounds Write Affecting nodejs package, versions [22.20.0,]
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- published22 Oct 2026
- disclosed21 Oct 2026
- creditmcollina
Introduced: 21 Oct 2026
NewCVE-2026-111497 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write via block-switch handling in the Brotli decoder, specifically DecodeBlockTypeAndLength in deps/brotli/c/dec/decode.c. An attacker can execute arbitrary code by supplying a crafted Brotli-compressed stream with an invalid block switch to Node.js code that decodes it; the decoder fails to propagate the block-switch error during command processing, allowing the out-of-bounds write.
Notes
- At a literal, command, or distance block-switch, the vulnerable path is reached when that stream’s block-type count is at most one (max_block_type <= 1); the decoder’s boolean failure is then discarded by the unsafe switch path, which continues processing.