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Critical 9.2Published Mar 25, 2026

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

Updated under an hour ago ()

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It affects squid-cache squid and 9 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
9.2 CRITICAL (v4.0, CNA)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
Weakness (CWE)
CWE-416, CWE-826, CWE-825
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
GitHub_M
NVD analysis
Modified
Record last updated
Jul 14, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
squid-cache squid
squid_cache:squid (from the name)
before 7.5
CNA record
from 7:6.10-6.el10_1.3 not affected
CISA ADP
from 7:6.10-5.el10_0.2 not affected
CISA ADP
from 7:3.5.20-17.el7_9.16 not affected
CISA ADP
from 8040020260514123440.522a0ee4 not affected
CISA ADP
from 8040020260514123440.522a0ee4 not affected
CISA ADP
from 8060020260518090356.ad008a3a not affected
CISA ADP
from 8060020260518090356.ad008a3a not affected
CISA ADP
from 7:5.5-13.el9_4.5 not affected
CISA ADP
squid-cache squid
squid-cache:squid
before 7.5
NVD

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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