---
cve: "CVE-2026-73508"
severity: "MEDIUM"
cvss: 5.3
epss: "33%"
vendor: "netty"
kev: false
exploited: false
published: "2026-08-13 15:20:17"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T21:05:33+02:00"
---

# CVE-2026-73508

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

## 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)

- fca0764703b3bb59c6e6dc5d29c6d9710d35c0e6 (Commit)
- 3703d79669ee024f6483c9d8697ac58ba546df33 (Commit)

## Referenzen

- <https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3>
- <https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b>
- <https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6>
- <https://github.com/netty/netty/releases/tag/netty-4.1.136.Final>
- <https://github.com/netty/netty/releases/tag/netty-4.2.16.Final>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73508) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_