Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-33526

Squid vulnerable to Denial of Service in ICP Request handling
Back to all
CVE

CVE-2026-33526

Squid vulnerable to Denial of Service in ICP Request handling

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.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.2
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

http://www.openwall.com/lists/oss-security/2026/03/25/2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33526.json, https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91, https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg, https://nvd.nist.gov/vuln/detail/CVE-2026-33526

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.01701%
EPSS Percentile
0.82228%
Introduced Version
0
Fix Available
2e58fa81c730f29f6ec52ef8bd056e658e01d50c,7.5,7:5.5-22.el9_7.4

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading