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

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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).

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: AMZN) — https://github.com/aws/aws-network-policy-agent/releases/tag/v1.3.7
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: AMZN) — https://github.com/aws/amazon-vpc-cni-k8s/releases/tag/v1.22.3

## Affected products and versions

- AWS / aws-network-policy-agent: ≥ 0; < 1.3.7 (affected, custom). Source: CNA: AMZN
- AWS / amazon-vpc-cni-k8s: ≥ 0; < 1.22.3 (affected, custom). Source: CNA: AMZN

## Severity and prioritization

- 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; source: CNA: AMZN

- 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; source: CNA: AMZN

- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: ff89ba41-3aa1-4d27-914a-91399e9639e5

- 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; source: NVD: ff89ba41-3aa1-4d27-914a-91399e9639e5

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-1189

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/aws/aws-network-policy-agent/releases/tag/v1.3.7 (CNA: AMZN; release-notes, patch)

- https://github.com/aws/amazon-vpc-cni-k8s/releases/tag/v1.22.3 (CNA: AMZN; release-notes, patch)

- https://aws.amazon.com/security/security-bulletins/2026-170-aws/ (CNA: AMZN; vendor-advisory)

- https://github.com/aws/aws-network-policy-agent/security/advisories/GHSA-mm5f-ggvx-hmvw (CNA: AMZN; third-party-advisory)

- https://aws.amazon.com/security/security-bulletins/2026-170-aws/ (ff89ba41-3aa1-4d27-914a-91399e9639e5)

- https://github.com/aws/amazon-vpc-cni-k8s/releases/tag/v1.22.3 (ff89ba41-3aa1-4d27-914a-91399e9639e5)

- https://github.com/aws/aws-network-policy-agent/releases/tag/v1.3.7 (ff89ba41-3aa1-4d27-914a-91399e9639e5)

- https://github.com/aws/aws-network-policy-agent/security/advisories/GHSA-mm5f-ggvx-hmvw (ff89ba41-3aa1-4d27-914a-91399e9639e5)

## Provenance

- CNA: AMZN: https://www.cve.org/CVERecord?id=CVE-2026-122266; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-122266; retrieved 2026-11-05; source updated 2026-11-04

Revision: 18448cd4331c3fa00e8a56d1bb1caf74f78ac14f0ab1a2aa03052027377f55d9

Canonical: https://y2.dev/cve/CVE-2026-122266

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