CVE-2026-73508Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-772
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Aug 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
netty netty netty:netty (from the name) | before 4.1.136.Final; from 4.2.0.Final, < 4.2.16.Final | CNA record |
netty netty netty:netty | before 4.1.136; from 4.2.0 before 4.2.16 | NVD |
References
- https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3x-refsource-confirm, vendor-advisory
- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bx-refsource-misc, patch
- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6x-refsource-misc, patch
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Finalx-refsource-misc, release-notes
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Finalx-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.