Debian dsa-6529 : libwebsockets-dev - security update

critical Nessus Plugin ID 351210

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6529 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6529-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff September 29, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : libwebsockets CVE ID : CVE-2026-19773

It was discovered that missing input validation in the hpack path header parser of libwebsockets could result in denial of service or potentially the execution of arbitrary code.

For the stable distribution (trixie), this problem has been fixed in version 4.3.5-1+deb13u3.

We recommend that you upgrade your libwebsockets packages.

For the detailed security status of libwebsockets please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libwebsockets

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

Solution

Upgrade the libwebsockets-dev packages.

Plugin Details

Severity: Critical

ID: 351210

File Name: debian_DSA-6529.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 9/29/2026

Updated: 9/29/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.23

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-19773

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:libwebsockets-dev, p-cpe:/a:debian:debian_linux:libwebsockets-evlib-ev, p-cpe:/a:debian:debian_linux:libwebsockets-evlib-glib, p-cpe:/a:debian:debian_linux:libwebsockets-evlib-uv, p-cpe:/a:debian:debian_linux:libwebsockets-test-server-common, p-cpe:/a:debian:debian_linux:libwebsockets-test-server, p-cpe:/a:debian:debian_linux:libwebsockets19t64

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 9/29/2026

Vulnerability Publication Date: 9/15/2026

Reference Information

CVE: CVE-2026-19773

Detections

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