---
cve: "CVE-2026-5950"
severity: "MEDIUM"
cvss: 5.3
epss: "66%"
vendor: "ISC"
kev: false
exploited: false
published: "2026-05-20 13:16:40"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T21:31:26+02:00"
---

# CVE-2026-5950

> 5.3 MEDIUM

## Beschreibung

An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.
This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- cd4a53b4630ba8646b2071ea8161d578b4185a94 (Commit)
- 7d0b4d4d436e7b950225a533e5bc56d8f935cc1c (Commit)

## Referenzen

- <https://kb.isc.org/docs/cve-2026-5950>
- <https://downloads.isc.org/isc/bind9/9.18.49>
- <https://downloads.isc.org/isc/bind9/9.20.23>
- <https://downloads.isc.org/isc/bind9/9.21.22>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-5950) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_