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CVE-2026-44249

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

Published: Jun 11, 2026Updated: Jun 11, 2026 Sources: CVE List NVD
NVD MITRE
8.1CVSS
HIGH

Netty is a network application framework for development of protocol servers and clients. In netty-handler prior to versions 4.1.135.Final and 4.2.15.Final, an attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High

Weaknesses

CWE-284CWE-697

Affected Products

netty
netty
OSS Libraries / generic-library
nettyoss-projectOSS Librariesaka io.netty:netty, netty-incubator-codec-ohttp

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86
github.com
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
github.com
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
github.com

Timeline

Published
Jun 11, 2026
Last Updated
Jun 11, 2026

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