What is CVE-2026-122266?

CVE-2026-122266 is a high-severity vulnerability in AWS Amazon-Vpc-Cni-K8s, classified under CWE-1189. CVSS score: 8.7/10. Published 2026-11-04.

How severe is CVE-2026-122266?

High severity. CVSS v3 base score is 8.7 out of 10.

Vulnerability in AWS Amazon-Vpc-Cni-K8s

CVE-2026-122266

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).

Published 2026-11-04 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-1189

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-122266?: CVE-2026-122266 is a high-severity vulnerability in AWS Amazon-Vpc-Cni-K8s, classified under CWE-1189. CVSS score: 8.7/10. Published 2026-11-04.
How severe is CVE-2026-122266?: High severity. CVSS v3 base score is 8.7 out of 10.