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  5. GHSA-mfg7-5gfp-c4w3

GHSA-mfg7-5gfp-c4w3: Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names

July 24, 2026

A memory leak can be caused in Netty’s DNS codec by sending malicious DNS packets containing invalid domain names. Because the leak occurs incrementally per packet, sustained malicious requests will cause a gradual Denial of Service.

References

  • github.com/advisories/GHSA-mfg7-5gfp-c4w3
  • github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b
  • github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
  • github.com/netty/netty/pull/17063
  • github.com/netty/netty/pull/17065
  • github.com/netty/netty/releases/tag/netty-4.1.136.Final
  • github.com/netty/netty/releases/tag/netty-4.2.16.Final
  • github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3

Code Behaviors & Features

Detect and mitigate GHSA-mfg7-5gfp-c4w3 with GitLab Dependency Scanning

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Affected versions

All versions before 4.1.136, all versions starting from 4.2.0 before 4.2.16

Fixed versions

  • 4.1.136
  • 4.2.16

Solution

Upgrade to versions 4.1.136, 4.2.16 or above.

Impact 5.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Learn more about CVSS

Weakness

  • CWE-772: Missing Release of Resource after Effective Lifetime

Source file

maven/io.netty/netty-codec-dns/GHSA-mfg7-5gfp-c4w3.yml

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