CVEvulnerability

CVE-2026-42579

9.1 CRITICAL Published 2026-05-13 Modified 2026-09-18 Official page ↗
Status
Modified
Published
2026-05-13
Last modified
2026-09-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-1286, CWE-20, CWE-400, CWE-626

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.

Affected configurations

• netty netty (< 4.1.133) • netty netty (>= 4.2.0 < 4.2.13)

Related

Weakness · CWE (4)

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

References