CVE-2026-42579

CRITICAL EPSS 40.4%

Published May 13, 20261mo ago · Modified Jun 17, 20262w ago

9.1 CVSS 3.1

Critical

Published May 13, 2026 1mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

9.1

Exploitability

3.9

Impact

5.2

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity High

Availability High

Threat Intelligence

EPSS Exploit Probability

40.4% percentile

Exploit & Patch Status

Public Exploit Known

No Patch Available

Weaknesses 3

CWE-20 Improper Input Validation Validation

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

CWE-626

Affected Products 2

Vendor	Product	Version	Range
netty	netty	*	<4.1.133
netty	netty	*	≥4.2.0 – <4.2.13

References 1

github.com https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm

ExploitMitigationVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.