Brotli decoder flaw CVE-2026-111497 affects Node.js, Bun, Python packages and Envoy; code execution was demonstrated on one Node.js build.
The vulnerability in Google’s Brotli decoder, first called “node2shell”, affects more software. Admins should update promptly.
A critical flaw dubbed 'HTTP2Shell' in Brotli, the C decoder library built into Node.js, could allow attackers to corrupt memory and access sensitive data.
OpenAI found a remote code execution flaw in the Brotli compression library, prompting Node.js, Bun, Envoy and PyPI maintainers to ship patches.
Node.js says the Brotli decoder ‘kept appending input bytes to an eight-byte internal buffer’. Microsoft has now patched .NET against it.
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