---
id: "CVE-2026-110720"
kind: "vulnerability"
aliases: ["CVE-2026-110720"]
title: "Consul-k8s: cross-namespace ACL bypass lets attackers gain elevated Consul privileges"
severity: "critical"
cvss: 9.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["consul", "hashicorp", "infrastructure", "kubernetes"]
not_affected_if: ["default-config"]
published_at: "2026-10-26T19:16:29+00:00"
first_seen_at: "2026-10-26T19:32:06+00:00"
updated_at: "2026-10-26T19:33:57+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110720", "first_seen_at": "2026-10-26T19:32:06+00:00"}]
---

# Consul-k8s: cross-namespace ACL bypass lets attackers gain elevated Consul privileges

Consul-k8s, the Kubernetes integration for HashiCorp Consul, has a cross-namespace authorization bypass in its component ACL binding rules. An attacker can obtain elevated Consul privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the consul-k8s version in use, for example with `consul-k8s version` or the image tag of the consul-k8s controller deployment.
- Confirm whether the installed version is `0.42.0` or later and below the fixed releases.

## Fix

- Upgrade consul-k8s to `2.1.0` (or `1.8.18` on the 1.8 line).

## Timeline

- 2026-10-26T19:32:06+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-110720

## From the sources

Consul-k8s versions 0.42.0 and later are vulnerable to a cross-namespace authorization bypass in component ACL binding rules that may allow an attacker to obtain elevated Consul privileges. This vulnerability (CVE-2026-110720) is fixed in consul-k8s 2.1.0 and 1.8.18.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_