Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-1528

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
12/03/2026
Last modified:
12/03/2026

Description

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici&amp;#39;s ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process.<br /> <br /> Patches<br /> <br /> Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools