Antrea has invalid enforcement order for network policy rules caused by integer overflow in antrea.io/antrea

Open Source Vulnerabilities CVE-2026-25804

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.

Open Source Vulnerabilities GO-2026-4461

Antrea has invalid enforcement order for network policy rules caused by integer overflow in antrea.io/antrea. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: antrea.io/antrea before v2.3.2, from v2.4.0 before v2.4.3.

Open Source Vulnerabilities GHSA-86x4-wp9f-wrr9

### Impact 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. If a user creates a large number of Antrea NetworkPolicies (ANP or ACNP) with varying priorities, some rules with lower logical priorities (higher numerical priority values) may take precedence over rules with higher logical priorities (lower numerical priority values). Traffic that should be denied by the configured Antrea NetworkPolicies may end up being allowed, potentially letting an attacker access a sensitive service. Traffic that should be allowed by the configured Antrea NetworkPolicies may end up being denied, breaking applications and potentially opening the door for denial-of-service attacks. The Antrea NetworkPolicy system comes with support for priority Tiers. Rules defined within a Tier cannot take precedence over rules defined in higher priority Tiers. Some users / roles may only be authorized to define within specific Tiers. This security vulnerability enables such users to intentionally "escape" their Tier and override rules in higher priority Tiers. Antrea deployments that *only* use upstream Kubernetes NetworkPolicies - and do not use Antrea NetworkPolicies - are not affected. ### Patches https://github.com/antrea-io/antrea/pull/7496 Antrea v2.5.0 Antrea v2.4.3 Antrea v2.3.2 ### Workarounds Antrea deployments that *only* use upstream Kubernetes NetworkPolicies - and do not use Antrea NetworkPolicies - are not affected. For users leveraging Antrea NetworkPolicies, there is no way to fix or remediate the vulnerability without upgrading. ### Resources https://gist.github.com/antoninbas/c429cc3e5bb8479ba7ff38fd6fde59d9 https://github.com/antrea-io/antrea/pull/7496 https://github.com/antrea-io/antrea/blob/main/docs/antrea-network-policy.md