CVE-2026-19015 HashiCorp CVE debrief

Who should care

Operators and administrators of Consul Community Edition and Consul Enterprise instances should be aware of this vulnerability and take steps to patch or mitigate it. They should review their deployments, assess potential impact, and prioritize patching vulnerable instances. Security teams and vulnerability management teams should also be aware of this vulnerability and track its status. Additionally, platform administrators and operators should consider implementing compensating controls and monitoring for potential cache exhaustion attacks. This vulnerability may allow a remote caller to grow the agent's Connect CA roots cache without bound, defeating the operator's cache-disable configuration. Therefore, it is crucial for operators to take proactive measures to prevent potential cache exhaustion attacks. The issue is fixed in Consul 2.0.3 and Consul Enterprise 1.21.17, 1.22.11, and 2.0.3, which operators should consider applying as part of their remediation efforts. Furthermore, operators should also consider reviewing relevant monitoring, detection, and logs for exposed assets that need extra review. By taking these steps, operators can help prevent potential security breaches and ensure the integrity of their Consul instances. In addition, operators should track exceptions, retest remediated assets, and close the item only after evidence is documented. This will help ensure that the vulnerability is properly addressed and that the risk of exploitation is minimized. Overall, it is essential for operators and administrators to take a proactive and comprehensive approach to addressing this vulnerability and preventing potential security breaches. This includes not only patching vulnerable instances but also implementing compensating controls, monitoring for potential attacks, and reviewing relevant logs and documentation. By doing so, operators can help protect their Consul instances and prevent potential security breaches. The CVE record and NVD entry provide limited information about the vulnerability, and further investigation is needed to fully understand the impact and potential mitigations. Therefore, operators should exercise caution and take a thorough

Technical summary

CVE-2026-19015 is an uncontrolled resource consumption issue in the Connect CA roots endpoint of Consul Community Edition and Consul Enterprise 1.2.0 through 2.0.2. This vulnerability may allow a remote caller to grow the agent's Connect CA roots cache without bound, defeating the operator's cache-disable configuration. The issue is fixed in Consul 2.0.3 and Consul Enterprise 1.21.17, 1.22.11, and 2.0.3.

Defensive priority

Operators should prioritize patching vulnerable Consul instances to prevent potential cache exhaustion attacks.

Recommended defensive actions

• Patch vulnerable Consul instances to version 2.0.3 or later
• Implement cache-disable configuration for Consul agents
• Monitor Consul agent logs for potential cache exhaustion attacks
• 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.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is needed to fully understand the impact and potential mitigations. The vulnerability affects Consul Community Edition and Consul Enterprise 1.2.0 through 2.0.2. Operators should verify their deployments and consider patching or mitigating the vulnerability. Evidence is limited, and defenders should review the official advisory and CVE record for more information.

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.