CVE-2026-73508

Published: Aug 13, 2026Modified: Sep 23, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

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 (2)

Products: Netty: Netty

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Netty Netty	version < 4.1.136
Netty Netty	4.2.0 ≤ version < 4.2.16

Related CWEs

Missing Release of Resource after Effective Lifetime

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.

References (5)

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b

Source: security-advisories@github.com

Patch

https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6

Source: security-advisories@github.com

Patch

https://github.com/netty/netty/releases/tag/netty-4.1.136.Final

Source: security-advisories@github.com

Release Notes

https://github.com/netty/netty/releases/tag/netty-4.2.16.Final

Source: security-advisories@github.com

Release Notes

https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3

Source: security-advisories@github.com

Vendor Advisory

Timeline

No history available yet.