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Description |
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ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination. The vulnerability exists because: * The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15 * The createInflateRaw() call is not wrapped in a try-catch block * The resulting exception propagates up through the call stack and crashes the Node.js process |
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CVSS V3.1 |
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AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Added |
CWE |
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CWE-248 |
| Added |
CWE |
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CWE-1284 |
| Added |
Reference |
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https://cna.openjsf.org/security-advisories.html |
| Added |
Reference |
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https://datatracker.ietf.org/doc/html/rfc7692 |
| Added |
Reference |
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https://github.com/nodejs/undici/security/advisories/GHSA-v9p9-hfj2-hcw8 |
| Added |
Reference |
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https://hackerone.com/reports/3487486 |
| Added |
Reference |
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https://nodejs.org/api/zlib.html#class-zlibinflateraw |