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CVE-2026-33515— Squid has issues in ICP message handling

Quick assessment

Affected
squid-cache squid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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，该漏洞源于输入验证不当，可能导致处理ICP流量时发生越界读取。

AI Predicted 5.3 Difficulty: Moderate EPSS 2.21% · P82
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I. Basic Information for CVE-2026-33515

Vulnerability Information
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Vulnerability Title
Squid has issues in ICP message handling
Source: CVE Program / CVE List V5
Vulnerability Description
Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. 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:L/VI:L/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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，该漏洞源于输入验证不当，可能导致处理ICP流量时发生越界读取。
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-2026-33515

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III. Intelligence Information for CVE-2026-33515

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Patches & Fixes for CVE-2026-33515 (3)

Vendor Advisories for CVE-2026-33515 (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-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling

IV. Related Vulnerabilities

Same product: squid
Same vendor: squid-cache
Same weakness: CWE-125

V. Comments for CVE-2026-33515

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