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.
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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