Trending
CVE-2026-33526

CVE detail

CVE-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 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 · CriticalBuzz score 43.9

Buzz score

Why this CVE is surfacing

Buzz score total 43.9

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 29.4 · diversity 14.5 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

29.4

18 evidence mentions in the snapshot

Diversity score

14.5

5 sources across 2 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 0; within the 30d window
Peak daily: 0; highest bucket

Evidence

Source links by recency

Newest mentions first

18 source links · newest first

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33526.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMar 26, 2026, 1:16 AM
https://bugzilla.redhat.com/show_bug.cgi?id=2451574bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/security/cve/CVE-2026-33526access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:9220access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:8880access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:8317access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:8119access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:6301access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:20580access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:20565access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:20564access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:11901access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:10257access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:10256access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
https://access.redhat.com/errata/RHSA-2026:10255access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 26, 2026, 1:16 AM
http://www.openwall.com/lists/oss-security/2026/03/25/2www.openwall.com
No excerpt available.
Exploitwww.openwall.comMar 26, 2026, 1:16 AM
https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwggithub.com
No excerpt available.
Exploitgithub.comMar 26, 2026, 1:16 AM
https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91github.com
No excerpt available.
Exploitgithub.comMar 26, 2026, 1:16 AM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

Related records

Similar CVEs

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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-33526.

Product-level CPE searches intentionally omit version fields and NVD version-range or configuration certainty. Verify the exact product version and configuration independently.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:a:squid-cache:squidSearch this product on Shodan

Exact CVE query

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Shodan's exact vuln: filter is separate from the product searches above and requires an eligible paid Shodan plan.

vuln:CVE-2026-33526Search this CVE on Shodan

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Metadata

Canonical fields

NVD status

Modified

Published

Mar 26, 2026

Modified

Jul 15, 2026

Official record

Authoritative NVD record

CVSS vector

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

CWE IDs

Vendor classifications

How this vector reads

CVSS 4.0 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Network. The vulnerable system can be reached across network boundaries.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Attack Requirements (AT): None. No prerequisite deployment or execution condition is required.
Privileges Required (PR): None. The attacker needs no privileges on the vulnerable system.
User Interaction (UI): None. Exploitation does not require a targeted user to act.
Vulnerable System Confidentiality (VC): None. There is no direct impact to this security property.
Vulnerable System Integrity (VI): None. There is no direct impact to this security property.
Vulnerable System Availability (VA): High. There is a total or serious impact to this security property.
Subsequent System Confidentiality (SC): None. There is no direct impact to this security property.
Subsequent System Integrity (SI): None. There is no direct impact to this security property.
Subsequent System Availability (SA): High. There is a total or serious impact to this security property.

Optional CVSS v4 metrics remain in the raw vector; only base metrics are expanded here.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses