Missing Release of Resource after Effective Lifetime Affecting io.netty:netty-codec-dns package, versions [,4.1.136.Final)[4.2.0.Alpha1,4.2.16.Final)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IONETTY-18854645
- published16 Aug 2026
- disclosed13 Aug 2026
- creditvioletagg
Introduced: 13 Aug 2026
NewCVE-2026-73508 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-dns to version 4.1.136.Final, 4.2.16.Final or higher.
Overview
Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime through DnsCodecUtil.decompressDomainName in codec-dns/src/main/java/io/netty/handler/codec/dns/DnsCodecUtil.java. An attacker can exhaust direct memory and trigger a gradual denial of service by sending DNS packets with malformed domain names that make domain-name encoding fail during decode. When encodeDomainName(domainName, result) throws on invalid input, the allocated ByteBuf is not released, and repeated packets leak buffers until the process runs out of memory.