# CVE-2026-73508

## Summary

- **CVE ID:** CVE-2026-73508
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** CWE-772
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 13, 2026

## Description

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.

## Affected Products

- netty — netty (< 4.1.136.Final)
- netty — netty (>= 4.2.0.Final, < 4.2.16.Final)

## References

- [CNA](https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3)
- [CNA](https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b)
- [CNA](https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6)
- [CNA](https://github.com/netty/netty/releases/tag/netty-4.1.136.Final)
- [CNA](https://github.com/netty/netty/releases/tag/netty-4.2.16.Final)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 26.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._