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Squid < 7.5 Multiple Vulnerabilities

critical Nessus Plugin ID 303933

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Synopsis

The remote proxy server is affected by multiple vulnerabilities.

Description

The version of Squid on the remote host is prior to 7.5. It is, therefore, affected by multiple vulnerabilities:

 - Due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. This attack is limited to Squid deployments that explicitly enable ICP support. (CVE-2026-33526)

 - Due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This allows a remote attacker to receive small amounts of memory potentially containing sensitive information.
 (CVE-2026-33515)

 - Due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid is vulnerable to Denial of Service when handling ICP traffic. (CVE-2026-32748)

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

Solution

Upgrade to Squid version 7.5 or later.

See Also

http://www.nessus.org/u?0b3b7260

http://www.nessus.org/u?1eee3cfb

http://www.nessus.org/u?3fc3425a

Plugin Details

Severity: Critical

ID: 303933

File Name: squid_7_5.nasl

Version: 1.3

Type: Remote

Family: Firewalls

Published: 3/27/2026

Updated: 3/31/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-33515

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:U

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:/a:squid-cache:squid

Required KB Items: Settings/ParanoidReport, installed_sw/Squid

Exploit Ease: No known exploits are available

Patch Publication Date: 3/25/2026

Vulnerability Publication Date: 3/25/2026

Reference Information

CVE: CVE-2026-32748, CVE-2026-33515, CVE-2026-33526

IAVB: 2026-B-0076