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Improper Access Control

CVE-2026-44249

High
9.2/10

Summary

Netty is a network application framework for development of protocol servers and clients. In netty-handler versions through 4.1.134.Final, 4.2.x through 4.2.14.Final and 5.x through 5.0.0.Alpha2, 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.

  • HIGH
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • HIGH

CWE-284 - Improper Access Control

Listed 5th in the 'OWASP Top Ten', improper (or broken) access control attacks are a fundamental type of vulnerability. This includes a broad range of design flaws that enable users to act outside of their intended permissions. They can use these privileges to gain access to restricted files and functionality such as accessing restricted information, falsifying records, destroying data, or executing commands.

References

Advisory Timeline

  • Published