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Vulnerabilities

Vulnerability · CVE-2026-33526

Squid is a caching proxy for the Web.

Published Mar 26, 2026 · catalog updated Jul 15, 2026 · Squid is a caching

Check if you run it

No confirmed exploitation is on record for CVE-2026-33526. EPSS is 8.94%. Act only if a listed version of Squid is a caching is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Squid is a caching).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
8.94%
Remediation
Advisory link
Affected products
cpe squid-cache/squid

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 ). This problem _cannot_ be mitigated by denying ICP queries using rules. Version 7.5 contains a patch.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe squid-cache/squidversion unspecified

How to fix CVE-2026-33526

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33526. EPSS is 8.94%. Act only if a listed version of Squid is a caching is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free; CWE-825; CWE-826. EPSS 8.94%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 26, 2026 · NIST NVD

    Detected

    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

  2. Jul 15, 2026 · NIST NVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-33526

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33526

    30-day exploitation probability 8.9%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33526

    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 servic

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.