Review reviewCritical

CVE-2026-42579

netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16

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: 9.1
EPSS: 0.97%
CISA KEV: Not listed
Published: 2026.05.14

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.97%

Technical severityCVSS 9.1

Vulnerability overview

Affected product and versions

Product: netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
Affected versions: >= >= 4.2.0.Alpha1, < 4.2.13.Final, >= < 4.1.133.Final, < 4.1.133, >= 4.2.0 < 4.2.13
Fixed versions: 4.1.133, 4.2.13

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CWE: CWE-1286, CWE-20, CWE-400, CWE-626