Consul-k8s: authentication bypass

HashiCorp Tooling

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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Upgrade Tooling to 2.0.4.

Fix it

Upgrade to Tooling 2.0.4

First seen: 27 Oct 2026
Last update: 27 Oct 2026, 15:18 UTC
Fixed in: 2.0.4
Identifiers: CVE-2026-110720
CVSS: 9.9
Source: news

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## Consul-k8s: authentication bypass
Severity: critical. Patch status: patched.
Affected: HashiCorp Tooling
Fixed in: 2.0.4
Ids: CVE-2026-110720

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.

## Steps
1. Search the repo, its CI and infra config for HashiCorp Tooling. If present, report the version in use and whether it's affected.
2. Fix by release line: Tooling: 2.0.4.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Tooling | fixed | 2.0.4 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-110720") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://discuss.hashicorp.com/t/hcsec-2026-50-consul-k8s-vulnerable-to-a-cross-namespace-authorization-bypass-in-component-acl-binding-rules/77915 https://nvd.nist.gov/vuln/detail/CVE-2026-110720
https://pwned.coffee/i/consul-k8s-authentication-bypass-cve-2026-110720

Timeline

27 Oct 2026, 15:18 UTC
Fix status: unknown → patched.
27 Oct 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Tooling before 2.0.4 2.0.4 CVE record (CNA) checked 27 Oct
Score: CVSS 9.9 (critical). CVSS 3.1 9.9 (CNA HashiCorp) for CVE-2026-110720
Last checked: 27 Oct 2026, 16:17 UTC

Product	Affected	Fixed in	Source
Tooling	before 2.0.4	2.0.4	CVE record (CNA) checked 27 Oct

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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