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HIGHCVE-2026-1528Published Modified CNA openjs

CVE-2026-1528: undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client

ImpactA 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.

Metrics

CVSS v3.1
7.5
Severity
HIGH
Fixed in
6.24.0: 7.24.0
Affected Products
1

Fix available

6.24.0: 7.24.0
Affected packages
  • undici / undici
    >= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0
    Fixed in 6.24.0: 7.24.0
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
CVE-2026-1528: undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client | HarborGuard CVE