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CVE-2026-42579

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CVE-2026-42579

Published: May 13, 2026

Modified: May 18, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

VendorProductVersions

netty

netty

affected
>= 4.2.0.Alpha1, < 4.2.13.Final
affected
< 4.1.133.Final

Weaknesses (CWE)

CWE-20
CWE-400
CWE-626

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

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