Node.js Module Undici 8.1.x < 8.5.0 DoS (CVE-2026-9675)

high Nessus Plugin ID 322410

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Synopsis

A module in the Node.js JavaScript run-time environment is affected by a denial of service vulnerability.

Description

The nodejs module Undici detected on the host is version 8.1.x prior to 8.5.0. It is, therefore, affected by a denial of service vulnerability:

- The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream many small fragments that each pass per-frame validation but collectively exceed the configured limit, causing unbounded memory growth in the client process. (CVE-2026-9675)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Undici version 8.5.0 or later.

Plugin Details

Severity: High

ID: 322410

File Name: nodejs_module_undici_CVE-2026-9675.nasl

Version: 1.2

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 6/24/2026

Updated: 6/25/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-9675

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:undici:undici

Required KB Items: installed_sw/Node.js, Host/nodejs/modules/enumerated

Exploit Ease: No known exploits are available

Patch Publication Date: 6/17/2026

Vulnerability Publication Date: 6/17/2026

Reference Information

CVE: CVE-2026-9675

Detections

Analytics