CVE-2026-1528

HighCVSS 7.5/10Last modified Sep 4, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-248CWE-1284

Affected software

No affected versions have been published.

Timeline

Published
Mar 12, 2026
Last modified
Sep 4, 2026
NVD status
Modified

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CVE-2026-1528: High severity, CVSS 7.5 | Vulnix