---
cve: "CVE-2026-5172"
severity: "HIGH"
cvss: 7.3
epss: "2.7%"
vendor: "dnsmasq"
kev: false
exploited: false
published: "2026-05-11 18:16:41"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T10:17:39+02:00"
---

# CVE-2026-5172

> 7.3 HIGH · 🧪 PoC

## Beschreibung

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 82c58cc45435ddd77875daf368cf64398bc15966 (Commit)

## Referenzen

- <https://www.kb.cert.org/vuls/id/471747>
- <https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html>
- <https://thekelleys.org.uk/dnsmasq/CVE/>
- <https://github.com/NixOS/nixpkgs/pull/519082>
- <https://github.com/NixOS/nixpkgs/pull/519093>
- <https://github.com/pi-hole/FTL/releases/tag/v6.6.2>
- <https://access.redhat.com/errata/RHSA-2026:19158>
- <https://access.redhat.com/security/cve/CVE-2026-5172>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2458521>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-5172) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_