Vulnerabilities CVE-2026-1528

CVE-2026-1528

High

Open

TLP:CLEAR

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

NVD CVE.org

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Description

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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.49%

39.9th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Mar 12, 2026
Last Modified: Aug 4, 2026

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