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CVE-2026-32748— Squid has Denial of Service in ICP Response 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，该漏洞源于处理ICP流量时过早释放资源和堆释放后重用错误，可能导致远程攻击者执行可靠的拒绝服务攻击。

AI Predicted 7.5 Difficulty: Moderate EPSS 9.98% · P95

Affected Version Matrix 1

VendorProduct Version RangeStatus
squid-cache squid < 7.5 affected
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I. Basic Information for CVE-2026-32748

Vulnerability Information
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Vulnerability Title
Squid has Denial of Service in ICP Response handling
Source: CVE Program / CVE List V5
Vulnerability Description
Squid is a caching proxy for the Web. Prior to version 7.5, 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. 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. This bug is fixed in Squid version 7.5.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
资源加锁不恰当
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，该漏洞源于处理ICP流量时过早释放资源和堆释放后重用错误，可能导致远程攻击者执行可靠的拒绝服务攻击。
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-2026-32748

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III. Intelligence Information for CVE-2026-32748

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Patches & Fixes for CVE-2026-32748 (1)

Vendor Advisories for CVE-2026-32748 (1)

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

CVE-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling
CVE-2026-33515 Squid has issues in ICP message handling

IV. Related Vulnerabilities

Same product: squid
Same vendor: squid-cache
Same weakness: CWE-413

V. Comments for CVE-2026-32748

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