Bug 2515377 (CVE-2026-73508) - CVE-2026-73508 io.netty/netty-codec-dns: Netty: Denial of Service via Memory Leak in DNS Record Decoder with Malformed Domain Names
Summary: CVE-2026-73508 io.netty/netty-codec-dns: Netty: Denial of Service via Memory ...
Keywords:
Status: NEW
Alias: CVE-2026-73508
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-13 15:50 UTC by OSIDB Bzimport
Modified: 2026-08-18 14:23 UTC (History)
78 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-13 15:50:58 UTC 
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.
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