What is CVE-2026-42579?

CVE-2026-42579 is a high-severity vulnerability in Netty, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-05-13.

How severe is CVE-2026-42579?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Netty

CVE-2026-42579

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 bidirecti…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.000 (9.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Netty — versions >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42579?: CVE-2026-42579 is a high-severity vulnerability in Netty, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-05-13.
How severe is CVE-2026-42579?: High severity. CVSS v3 base score is 7.5 out of 10.