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CVE-2026-122266

6.3 mediumEPSS 0.3%

Medium (6.3) in aws. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

On this page
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).

Severity

CVSS 4.0

6.3 medium
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

CVSS 3.1

8.7 high
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
EPSS
0.3% estimated probability of exploitation activity in the next 30 days; 20th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-1189 Improper Isolation of Shared Resources on System-on-a-Chip (SoC)
Published
Modified
Assigned by
AMZN (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
aws-network-policy-agentbefore 1.3.7
AWS amazon-vpc-cni-k8sbefore 1.22.3

Red Hat

Red Hat rates this Important.

Red Hat's statement

This vulnerability is rated as Important because an authenticated adjacent attacker on the same node can break cross-pod network isolation boundaries across tenant scopes. Red Hat OpenShift platforms rely on native networking plugins such as OVN-Kubernetes rather than the AWS Network Policy Agent. Consequently, standard Red Hat environments are not affected by this vulnerability unless custom or unmanaged Amazon VPC CNI add-ons are running on the cluster.

Red Hat's mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-122266.

Attack patterns (CAPEC)

  • CAPEC-124 Shared Resource Manipulation Severity: Medium

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

Check your stackJSON