---
cve: "CVE-2026-33526"
severity: "CRITICAL"
cvss: 9.2
epss: "8.9%"
vendor: "squid-cache"
kev: false
exploited: false
published: "2026-03-26 01:16:27"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T13:28:41+02:00"
---

# CVE-2026-33526

> 9.2 CRITICAL · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 2e58fa81c730f29f6ec52ef8bd056e658e01d50c (Commit)
- 8a7d42f9d44befb8fcbbb619505587c8de6a1e91 (Commit)

## Referenzen

- <https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg>
- <https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91>
- <http://www.openwall.com/lists/oss-security/2026/03/25/2>
- <https://access.redhat.com/errata/RHSA-2026:10255>
- <https://access.redhat.com/errata/RHSA-2026:10256>
- <https://access.redhat.com/errata/RHSA-2026:10257>
- <https://access.redhat.com/errata/RHSA-2026:11901>
- <https://access.redhat.com/errata/RHSA-2026:20564>
- <https://access.redhat.com/errata/RHSA-2026:20565>
- <https://access.redhat.com/errata/RHSA-2026:20580>
- <https://access.redhat.com/errata/RHSA-2026:6301>
- <https://access.redhat.com/errata/RHSA-2026:8119>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33526) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_