Debian dla-4537 : cgi-mapserver - security update

high Nessus Plugin ID 307616

Synopsis

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

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4537 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4537-1 [email protected] https://www.debian.org/lts/security/ Guilhem Moulin April 17, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : mapserver Version : 7.6.2-1+deb11u2 CVE ID : CVE-2026-33721

A heap-buffer-overflow was found in mapserver, a CGI-based framework for Internet map services, which could lead to Denial of Service via crafted SLD (Styled Layer Descriptor) sent by a remote unauthenticated attacker.

For Debian 11 bullseye, this problem has been fixed in version 7.6.2-1+deb11u2.

We recommend that you upgrade your mapserver packages.

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

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: PGP signature

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 cgi-mapserver packages.

Plugin Details

Severity: High

ID: 307616

File Name: debian_DLA-4537.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 4/20/2026

Updated: 4/20/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-33721

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:cgi-mapserver, p-cpe:/a:debian:debian_linux:libmapscript-perl, p-cpe:/a:debian:debian_linux:mapserver-bin, p-cpe:/a:debian:debian_linux:mapserver-doc, p-cpe:/a:debian:debian_linux:libmapscript-java, p-cpe:/a:debian:debian_linux:libmapserver-dev, p-cpe:/a:debian:debian_linux:libmapserver2, p-cpe:/a:debian:debian_linux:php-mapscript, p-cpe:/a:debian:debian_linux:php-mapscript-ng, p-cpe:/a:debian:debian_linux:python3-mapscript

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/17/2026

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-33721

Detections

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