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CVE-2026-33526— Squid vulnerable to Denial of Service in ICP Request handling

Quick assessment

Affected
squid-cache squid
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Squid是Squid开源的一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 7.5之前版本存在安全漏洞，该漏洞源于堆释放后重用，可能导致处理ICP流量时发生拒绝服务。

AI Predicted 6.5 Difficulty: Easy EPSS 12.80% · P96

Affected Version Matrix 1

VendorProduct Version RangeStatus
squid-cache squid < 7.5 affected
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I. Basic Information for CVE-2026-33526

Vulnerability Information
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Vulnerability Title
Squid vulnerable to Denial of Service in ICP Request handling
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Squid 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Squid是Squid开源的一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 7.5之前版本存在安全漏洞，该漏洞源于堆释放后重用，可能导致处理ICP流量时发生拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
squid-cache squid < 7.5 -

II. Public POCs for CVE-2026-33526

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III. Intelligence Information for CVE-2026-33526

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Patches & Fixes for CVE-2026-33526 (1)

Vendor Advisories for CVE-2026-33526 (1)

Same Patch Batch · squid-cache · 2026-03-26 · 3 CVEs total

CVE-2026-32748 Squid has Denial of Service in ICP Response handling
CVE-2026-33515 Squid has issues in ICP message handling

IV. Related Vulnerabilities

Same product: squid
Same vendor: squid-cache
Same weakness: CWE-416

V. Comments for CVE-2026-33526

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