Node.js Patches High-Severity Brotli Decoder Flaw Enabling Remote Code Execution

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Node.js has fixed CVE-2026-111497, a high-severity vulnerability in its Brotli decoder that can permit remote code execution when servers decompress specially crafted Brotli data from untrusted sources. The risk is concentrated in applications that accept and decode Brotli streams, such as through HTTP request bodies, rather than in Brotli compression generally. The flaw was reported by OpenAI Codex Security researchers Khai Tran and Sylvie Mayer and was addressed in Node.js's October 2026 security releases across three supported release lines. Organizations are advised to identify services that decode outside input and to update production runtimes to the patched versions, while noting that sending Brotli-compressed responses alone is not shown to be exposed. Separate patch status applies to other ecosystems such as Envoy and Bun, so they must be checked independently.

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