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CVE-2026-1528

Undici: Malicious WebSocket 64-bit length overflows parser and crashes the client

Impact

### Impact A server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. ### Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later. ### Workarounds There are no workarounds.

Affected packages

EcosystemPackageAffectedFixed in
npmundici>= 6.0.0, < 6.24.06.24.0

Affected products

VendorProductAffected versions
NodejsUndici
before 6.24.0
from 7.0.0 before 7.24.0

Weakness classification

CWE-248CWE-1284

References