Riskcovery

CVE-2026-44249

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

State
Published
Severity
8.1 High
Published
Jun 11, 2026
Updated
Sep 18, 2026
Reserved
May 5, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HGitHub_M
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hredhat-SADP

Weaknesses

  • CWE-284 Improper Access Control
  • CWE-697 Incorrect Comparison
  • CWE-1287 Improper Validation of Specified Type of Input

Affected Products

ProductVersions
nettynetty
  • >= 4.2.0.Final, < 4.2.15.FinalAffected
  • < 4.1.135.FinalAffected

References

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