Affects widely used AWS EKS networking component; bypasses network isolation enabling lateral movement across many cloud deployments.
CVE-2026-86831
EKS Network Policy Agent ID-collision allows NetworkPolicy bypass
Is CVE-2026-86831 being exploited?
Not confirmed. CVE-2026-86831 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.64% probability of exploitation in the next 30 days.
How severe is CVE-2026-86831?
CVE-2026-86831 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-86831?
Yes. A fix has been recorded for CVE-2026-86831. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-86831 affect?
CVE-2026-86831 affects aws-network-policy-agent < 1.4.0, amazon-vpc-cni-k8s (Managed Add-on) < 1.22.4, Amazon EKS clusters using AWS VPC CNI and Network Policy Agent. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-86831?
Upgrade aws-network-policy-agent to >=1.4.0 or amazon-vpc-cni-k8s to >=1.22.4
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can craft pod/namespace names to cause ID collisions, bypass NetworkPolicy and access co-located pods cross-namespace.
Immediate action required
- affected>= 1.14.0 and < 1.22.4
- affected< 1.4.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 17 Sept 2026 (SSVC 2.0.3).
timeline
- 16 Sept 2026Published
- 17 Sept 2026CISA SSVC assessment: exploitation none · 1 day later
- 18 Sept 2026Analysed by vulneraibility.com · 1 day later
- 20 Oct 2026CVE record last updated · 32 days later
also known as
- Advisoryaws.amazon.com /security/security-bulletins/2026-113-aws/
- Patchgithub.com /aws/amazon-vpc-cni-k8s/releases/tag/v1.22.4
- Patchgithub.com /aws/aws-network-policy-agent/releases/tag/v1.4.0
- Linkgithub.com /aws/aws-network-policy-agent/security/advisories/GHSA-7xv7-8r3j-3j25
- Linkgithub.com /aws/amazon-vpc-cni-k8s/security/advisories/GHSA-gjc7-c7mx-x8f3
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- OSV: advisory aliases and downstream package versions
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.