CVE-2026-73508
Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-772 |
| Vendor | netty |
| Product | netty |
| Published | Aug 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
netty / netty
< 4.1.136.Final >= 4.2.0.Final, < 4.2.16.Final
References
github.com: https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3 github.com: https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b github.com: https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 github.com: https://github.com/netty/netty/releases/tag/netty-4.1.136.Final github.com: https://github.com/netty/netty/releases/tag/netty-4.2.16.Final