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Vulnerabilities

CVE-2026-33526

High
Squid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to per
CWE-416 — Weakness Type
Published: Mar 26, 2026  ·  Modified: Apr 2, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

Squid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem _cannot_ be mitigated by denying ICP queries using `icp_access` rules. Version 7.5 contains a patch.

🤖 AI Executive Summary

Squid proxy versions prior to 7.5 contain a heap use-after-free vulnerability in ICP traffic handling that enables remote denial of service attacks. Organizations using Squid with ICP support enabled are at risk of service disruption through reliable and repeatable attacks.

📄 Description (Arabic)

تحتوي نسخ Squid السابقة للإصدار 7.5 على ثغرة استخدام الذاكرة بعد التحرير (Use-After-Free) في معالجة حركة بروتوكول ICP. يمكن للمهاجمين البعيدين استغلال هذه الثغرة لتنفيذ هجمات حرمان من الخدمة موثوقة وقابلة للتكرار ضد خدمة Squid. هذا الهجوم محصور على نشرات Squid التي تفعّل دعم ICP بشكل صريح.

🤖 ملخص تنفيذي (AI)

إصدارات Squid السابقة للإصدار 7.5 تحتوي على ثغرة استخدام الذاكرة بعد التحرير في معالجة حركة ICP مما يمكّن هجمات الحرمان من الخدمة عن بعد. المنظمات التي تستخدم Squid مع تفعيل دعم ICP معرضة لخطر انقطاع الخدمة من خلال هجمات موثوقة وقابلة للتكرار.

🤖 AI Intelligence Analysis Analyzed: May 3, 2026 13:19
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
telecom government banking energy
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.0
/ 10.0
🔧 Remediation Steps (English)
Upgrade Squid to version 7.5 or later immediately. If immediate upgrade is not possible, disable ICP support by setting icp_port to 0 in squid.conf configuration file and restart the Squid service. Implement network-level access controls to restrict ICP protocol traffic from untrusted sources.
🔧 خطوات المعالجة (العربية)
قم بترقية Squid إلى الإصدار 7.5 أو أحدث فوراً. إذا لم يكن الترقية الفورية ممكنة، قم بتعطيل دعم ICP بتعيين icp_port إلى 0 في ملف إعدادات squid.conf وأعد تشغيل خدمة Squid. طبّق عناصر تحكم في الوصول على مستوى الشبكة لتقييد حركة بروتوكول ICP من المصادر غير الموثوقة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.1.1.1 A.1.2.1 A.2.1.1 A.2.2.1
🔵 SAMA CSF
ID.BE-1 PR.IP-1 PR.IP-2 DE.CM-1
🟡 ISO 27001:2022
A.12.2.1 A.12.6.1 A.14.1.1 A.14.2.1
📦 Affected Products / CPE 1 entries
squid-cache:squid
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-416
EPSS1.70%
Exploit No
Patch ✓ Yes
Published 2026-03-26
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
patch-available CWE-416
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