CVE-2026-66786Network attack vector

Root command execution via ipsec.conf directive injection

Published Sep 2, 2026 · Updated Sep 3, 2026

Code injection in Red Hat Advanced Cluster Management for Kubernetes allows remote authenticated users to execute commands as root. In certificate-authentication mode, the gateway builds an ipsec.conf connection stanza from unvalidated CableName text, so embedded newlines become leftupdown directives. Exploitation requires cluster-admin compromise of a spoke cluster, broker credentials, a malicious Endpoint, and both certificate authentication and OVN-Kubernetes IPsec enabled.

CVSS severity9.1
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Red Hat Advanced Cluster Management for Kubernetes allows remote authenticated users to execute commands as root. In certificate-authentication mode, the gateway builds an ipsec.conf connection stanza from unvalidated CableName text, so embedded newlines become leftupdown directives. Exploitation requires cluster-admin compromise of a spoke cluster, broker credentials, a malicious Endpoint, and both certificate authentication and OVN-Kubernetes IPsec enabled.

The record

CVE
CVE-2026-66786
Published
Sep 2, 2026
Updated
Sep 3, 2026
Vendor
389 Directory Server
Product
Red Hat Advanced Cluster Management for Kubernetes
Classifications
CWE-94, T1210
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

389 Directory Server · Red Hat Advanced Cluster Management for KubernetesAffected versions are unavailable in this record.

Published CVSS scores

9.1Red HatCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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