CVE-2026-73508CWE-772

CVE-2026-73508

Medium · published August 13, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
31.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00382 · 31.0th percentile
Weakness
CWE-772 · Missing Release of Resource after Effective Lifetime
Published
2026-08-13T19:20Z
Affected products (2)
ProductVersionsFixed in
netty/netty< 4.1.1364.1.136
netty/netty≥ 4.2.0, < 4.2.164.2.16
References (5)
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b · [email protected]https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 · [email protected]https://github.com/netty/netty/releases/tag/netty-4.1.136.Final · [email protected]https://github.com/netty/netty/releases/tag/netty-4.2.16.Final · [email protected]https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3 · [email protected]
EPSS history
Timeline
  • 13 AUG 14:27Z
    Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names
    cvelistv5