antrea-io vulnerabilities and threats

CVE-2026-34992 is a vulnerability in antrea-io's Antrea Kubernetes networking solution affecting versions prior to 2.4.5 and between 2.5.0 and 2.5.2. In dual-stack Kubernetes clusters configured with IPsec encryption enabled, IPv6 Pod traffic is not encrypted and is transmitted in plaintext, while IPv4 traffic remains encrypted. This occurs because the IPv6 packets bypass the IPsec encryption layer despite being encapsulated. Single-stack IPv4 or IPv6 clusters are not affected.

Antrea is a Kubernetes networking solution intended to be Kubernetes native. Prior to versions 2.3.2 and 2.4.3, Antrea's network policy priority assignment system has a uint16 arithmetic overflow bug that causes incorrect OpenFlow priority calculations when handling a large numbers of policies with various priority values. This results in potentially incorrect traffic enforcement. This issue has been patched in versions 2.4.3.