VULNERABILITY INTELLIGENCE

CVE-2026-42579

CVSS score7.5 HIGH
EPSS probability1.01%
CISA KEVNot currently listed
Published2026-05-13
Last modified2026-09-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Weakness classification

  • CWE-20: Improper Input Validation
  • CWE-400: Uncontrolled Resource Consumption
  • CWE-626: Null Byte Interaction Error (Poison Null Byte)
  • CWE-1286: Improper Validation of Syntactic Correctness of Input

Primary references