Is CVE-2026-42579 actively exploited?

No active exploitation of CVE-2026-42579 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42579 be exploited remotely?

Yes. CVE-2026-42579 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42579?

CVE-2026-42579 has a CVSS score of 9.1 (CRITICAL).

HOME VULNERABILITIESCVE-2026-42579

CRITICAL

CVE-2026-42579

CWE-20Published: May 13, 2026· Updated: May 18, 2026

9.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42579 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.