CVE-2026-86831NVD

Vulnerability Summary

Improper validation of pod identifier uniqueness in aws-network-policy-agent in Amazon EKS Network Policy Agent before v1.4.0 might allow an authenticated remote user to bypass NetworkPolicy enforcement on co-located pods in other namespaces via crafted pod and namespace names that produce pod identifier collisions.

To remediate this issue, users should upgrade to Amazon EKS Network Policy Agent 1.4.0 or later and Amazon VPC CNI Managed Add-on v1.22.4 or later (which includes Network Policy Agent v1.4.0).

Severity Level

HIGH(8.7)

Published Date

Sep 16, 2026

Last Modified

Sep 17, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.46%Probability

Root Weakness (CWE)

CWE-1289: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v4.0 Base Metrics — Score 8.7 (HIGH)

Attack VectorNetwork

Attack ComplexityLow

Attack RequirementsPresent

Privileges RequiredHigh

User InteractionNone

Confidentiality (Vulnerable System)High

Integrity (Vulnerable System)High

Availability (Vulnerable System)None

Confidentiality (Subsequent System)High

Integrity (Subsequent System)High

Availability (Subsequent System)None

CVSS v3.1 Base Metrics — Score 8.7 (HIGH)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

Affected & Patched Versions

Affected Versions

AWS aws-network-policy-agent < 1.4.0
AWS amazon-vpc-cni-k8s >= 1.14.0 and < 1.22.4

Patched Versions

AWS aws-network-policy-agent 1.4.0
AWS amazon-vpc-cni-k8s 1.22.4

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