9.9 Critical

Consul-k8s versions 0.42.0 and later are vulnerable to a cross-namespace authorization bypass in component ACL binding rules that may allow…

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.

Proof-of-concept code is published

Public PoC

Public PoCGhost-Bx1/ConsulK8s-CVE-2026-110720

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 9.9 (v3.1)
Severity: Critical
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 26 October 2026
Last updated: 27 October 2026
Weakness: CWE-863
Assigner: security@hashicorp.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

At the source

References

https://discuss.hashicorp.com/t/hcsec-2026-50-consul-k8s-vulnerable-to-a-cross-namespace-authorization-bypass-in-component-acl-binding-rules/77915

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