Vulnerability · Published Nov 4, 2026 · Assigned by AMZN

CVE-2026-122266Improper isolation of shared resources in aws-network-policy-agent in Amazon EKS

High 8.7

In plain English

A high-severity security flaw in amazon-vpc-cni-k8s from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.3%top 82.4% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Improper isolation of shared resources in aws-network-policy-agent in Amazon EKS Network Policy Agent before 1.3.7 (VPC CNI before 1.22.3) might allow an authenticated adjacent user to bypass NetworkPolicy ingress enforcement on co-located pods via eBPF conntrack map poisoning using crafted AF_PACKET frames. To remediate this issue, users should upgrade to Amazon VPC CNI Managed Add-on v1.22.3 or later (which includes Network Policy Agent v1.3.7).

Affected products (as reported)

Vendor	Product	Versions
AWS	aws-network-policy-agent	0 – before 1.3.7
AWS	amazon-vpc-cni-k8s	0 – before 1.22.3

Weakness: CWE-1189 · Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

https://github.com/aws/aws-network-policy-agent/releases/tag/v1.3.7 release-notes, patch
https://github.com/aws/amazon-vpc-cni-k8s/releases/tag/v1.22.3 release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-170-aws/ vendor-advisory
https://github.com/aws/aws-network-policy-agent/security/advisories/GHSA-mm5f-ggvx-hmvw third-party-advisory