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TI-2026-20867 Aliases CVE-2026-25804GHSA-86x4-wp9f-wrr9

Antrea has invalid enforcement order for network policy rules caused by integer overflow

Priority MEDIUM 41CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass, Denial of service
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287 and CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00492 42nd percentileScored 2026-11-07
Fix Fixed antrea (antrea-io): 2.3.2, 2.4.3antrea.io/antrea (Go): 2.3.2, 2.4.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
antrea-ioantreabefore 2.3.2; 2.4.0 to before 2.4.32.3.2, 2.4.3Patch availableCNA
—antrea.io/antrea (Go)before 2.3.22.3.2Patch availableGHSA-86x4-wp9f-wrr9
—antrea.io/antrea (Go)2.4.0 to before 2.4.32.4.3Patch availableGHSA-86x4-wp9f-wrr9
  • antrea Vendorantrea-io Affected before 2.3.2; 2.4.0 to before 2.4.3 Fixed in 2.3.2, 2.4.3 Patch available CNA
  • antrea.io/antrea (Go) Vendor— Affected before 2.3.2 Fixed in 2.3.2 Patch available GHSA-86x4-wp9f-wrr9
  • antrea.io/antrea (Go) Vendor— Affected 2.4.0 to before 2.4.3 Fixed in 2.4.3 Patch available GHSA-86x4-wp9f-wrr9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:antrea:*:*:*:*:*:kubernetes:*:*before 2.3.2; 2.4.0 to before 2.4.3Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:antrea:*:*:*:*:*:kubernetes:*:* Versions before 2.3.2; 2.4.0 to before 2.4.3 Vulnerable ·backstage

Remediation

  • Fix · CNA antrea (antrea-io) Fixed in 2.3.2, 2.4.3
  • Fix · GHSA-86x4-wp9f-wrr9 antrea.io/antrea (Go) Fixed in 2.3.2 Advisory →
  • Fix · GHSA-86x4-wp9f-wrr9 antrea.io/antrea (Go) Fixed in 2.4.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25804
  2. 2026-10-03 Alias added: GHSA-86x4-wp9f-wrr9
  3. 2026-10-16 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 3

Advisory 1

Other 3

  • TI-2026-27213 Missing Encryption of Sensitive Data in antrea.io/antrea CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences