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CriticalVulnerabilityCVE-2026-110720updated 26 Oct 2026, 19:17 UTC

Consul-k8s lets attackers gain extra Consul privileges across namespaces

A flaw in the software that connects HashiCorp Consul to Kubernetes can let someone reach permissions they should not have, crossing the boundaries between separate Kubernetes namespaces. Updating closes the gap.

Fixed in consul-k8s 2.1.0 and 1.8.18Official source
SeverityCriticalCVSS 9.9 of 10
Being exploited?UnclearNo reports either way yet
Fix available?Yesconsul-k8s 2.1.0 and 1.8.18 · since 26 Oct 2026
How sure is this?Official sourceBacked by an official source

What happened

Consul-k8s versions 0.42.0 and later have a cross-namespace authorization bypass in component ACL binding rules, which may allow an attacker to obtain elevated Consul privileges.

Why it is dangerous: An attacker who abuses this could gain elevated Consul privileges, potentially affecting service discovery and access control for workloads across namespaces. Teams running Consul on Kubernetes with multiple namespaces are most at risk.

Are you affected?

You are affected if you run consul-k8s version 0.42.0 or later in a Kubernetes environment with Consul ACLs.

consul-k8s 0.42.0 and later (before the fixed versions below)

What to do

  1. Update consul-k8s to 2.1.0 or to 1.8.18, matching your release line
  2. Review Consul ACL and component binding rules for unexpected cross-namespace permissions
  3. Check Consul audit logs for unexpected privilege changes

Timeline

  1. 26 Oct 2026, 19:16 UTC
    Publicly disclosed
  2. 26 Oct 2026, 19:16 UTC
    Reported by NVD · NVD
  3. 26 Oct 2026, 19:17 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-110720
CVSS
9.9 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
26 Oct 2026, 19:16 UTC
On Zero Radar
26 Oct 2026, 19:17 UTC (1 min after disclosure)
Last change
26 Oct 2026, 19:17 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Consul-k8s lets attackers gain extra Consul privileges across namespaces · Zero Radar