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Debian dla-4697 : squid - security update

critical Nessus Plugin ID 329264

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4697 advisory.

 - ----------------------------------------------------------------------- Debian LTS Advisory DLA-4697-1 [email protected] https://www.debian.org/lts/security/ Utkarsh Gupta July 24, 2026 https://wiki.debian.org/LTS
 - -----------------------------------------------------------------------

 Package : squid Version : 4.13-10+deb11u7 5.7-2+deb12u6 CVE ID : CVE-2026-33515 CVE-2026-33526 CVE-2026-47729 CVE-2026-50012

 Multiple security issues were discovered in the Squid proxy caching server, which could result in information disclosure or denial of service.

 For Debian 11 bullseye, these problems have been fixed in version 4.13-10+deb11u7.

 For Debian 12 bookworm, these problems have been fixed in version 5.7-2+deb12u6.

 We recommend that you upgrade your squid packages.

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

 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

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

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

Solution

Upgrade the squid packages.

See Also

https://packages.debian.org/source/bookworm/squid

https://packages.debian.org/source/bullseye/squid

https://security-tracker.debian.org/tracker/CVE-2026-33515

https://security-tracker.debian.org/tracker/CVE-2026-33526

https://security-tracker.debian.org/tracker/CVE-2026-47729

https://security-tracker.debian.org/tracker/CVE-2026-50012

https://security-tracker.debian.org/tracker/source-package/squid

Plugin Details

Severity: Critical

ID: 329264

File Name: debian_DLA-4697.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/23/2026

Updated: 7/23/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6

Percentile: 96.65

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-50012

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

CVSS Score Source: CVE-2026-33515

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.7

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

CVSS Score Source: CVE-2026-33526

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:squid-cgi, p-cpe:/a:debian:debian_linux:squid-common, p-cpe:/a:debian:debian_linux:squid-openssl, p-cpe:/a:debian:debian_linux:squid-purge, p-cpe:/a:debian:debian_linux:squid, p-cpe:/a:debian:debian_linux:squidclient

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: 7/24/2026

Vulnerability Publication Date: 3/26/2026

Reference Information

CVE: CVE-2026-33515, CVE-2026-33526, CVE-2026-47729, CVE-2026-50012

IAVB: 2026-B-0076-S, 2026-B-0165