Is CVE-2026-33515 in the CISA KEV catalog?

No. CVE-2026-33515 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33515?

CVE-2026-33515 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-33515?

CVE-2026-33515 has an EPSS score of 1.04% (60th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33515?

Upgrade squid on debian 13 to 6.13-2+deb13u2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-33515

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-125Out-of-bounds Read CWE-1289

How to fix

Remediation Available

squidDebian

Fixed in:6.13-2+deb13u2CVE-2026-33515

Fixed in:7.5-1CVE-2026-33515

squidUbuntu

Fixed in:5.9-0ubuntu0.22.04.5USN-8157-1

Fixed in:6.14-0ubuntu0.24.04.2USN-8157-1

Fixed in:6.14-0ubuntu0.25.10.2USN-8157-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

1.04%probability of exploitation in 30 days

60thpercentile

Moderate risk: more likely to be exploited than 60% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

github.com

Third-Party Advisory1

openwall.com

Issue Tracking2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-31.