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CVE-2026-2229 is a high severity vulnerability with a CVSS score of 7.5. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
The 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:
isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15createInflateRaw() call is not wrapped in a try-catch blockHas the problem been patched? What versions should users upgrade to?
Is there a way for users to fix or remediate the vulnerability without upgrading?
| Vendor | Product |
|---|---|
| Node.js | Undici |
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