CVE-2026-110720 HashiCorp CVE debrief

Who should care

Defenders and administrators using Consul-k8s versions 0.42.0 and later should assess their exposure and prioritize patching or mitigating this vulnerability. This includes reviewing and updating ACL binding rules, monitoring for suspicious activity, and verifying patching or mitigation efforts. Security teams and operators managing Consul-k8s deployments should review the CVE record and NVD entry for details on the vulnerability and its impact.

Why it matters

CVE-2026-110720 is a critical vulnerability in Consul-k8s that requires immediate attention from defenders and administrators. It allows for a cross-namespace authorization bypass, potentially enabling attackers to gain elevated privileges. The vulnerability is fixed in consul-k8s 2.1.0 and 1.8.18, and defenders should prioritize patching or mitigating this vulnerability.

• Potential elevation of privileges for attackers
• Cross-namespace authorization bypass
• Impact on Consul-k8s versions 0.42.0 and later
• Verification of patching or mitigation required

Technical summary

CVE-2026-110720 is a critical vulnerability in Consul-k8s versions 0.42.0 and later. It allows for a cross-namespace authorization bypass in component ACL binding rules, potentially enabling an attacker to gain elevated Consul privileges. The vulnerability is fixed in consul-k8s 2.1.0 and 1.8.18. Defenders should assess their exposure and prioritize patching or mitigating this vulnerability, especially in environments using affected Consul-k8s versions. The CVE record and NVD entry provide details on the vulnerability, its impact, and fixed versions.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments using affected Consul-k8s versions.

Recommended defensive actions

• Patch Consul-k8s to version 2.1.0 or 1.8.18
• Review and update ACL binding rules
• Monitor for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and fixed versions. However, additional information from the vendor or other sources may be necessary to fully understand the vulnerability's scope and potential consequences.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.