CVE-2026-49089 Elastic CVE debrief

Who should care

Users of Kibana, especially those with read-only privileges, security teams, and platform operators should be aware of this potential denial of service vulnerability and take steps to mitigate it. Affected operators and platform administrators should review the vulnerability details and plan for mitigations or updates through normal change control processes. Vulnerability management and security teams should prioritize defensive reviews and compensating controls for exposed systems while remediation is scheduled and verified. Asset inventory and monitoring teams should check relevant logs for exposed assets that need extra review and track exceptions, retest remediated assets, and close the item only after evidence is documented. Those impacted should also consider rollback and change window strategies for remediation efforts. Source tracking and monitoring can help verify the effectiveness of these efforts and ensure that similar vulnerabilities are addressed promptly in the future. This requires coordination across multiple teams and stakeholders to ensure comprehensive coverage and minimize potential impacts on operations and services. The vulnerability's impact on business operations should be carefully assessed, and appropriate measures should be taken to minimize potential disruptions. This includes reviewing and updating incident response plans, as necessary, to address potential denial-of-service scenarios. By taking proactive steps, organizations can reduce their risk exposure and ensure the security and reliability of their Kibana deployments. To further enhance their security posture, organizations should consider implementing additional security controls, such as network segmentation, access controls, and monitoring, to detect and respond to potential security incidents. Regular security audits and penetration testing can also help identify vulnerabilities and weaknesses, allowing organizations to address them before they can be exploited. By prioritizing security and taking proactive measures, organizations can minimize the risk of denial-of-service attacks and ensure the integrity and availability of their Kibana deployments. Effective security is,

Technical summary

A query expression accepted by a connector reporting operation in Kibana was processed without any limit on its size, and an oversized expression caused the Kibana process to spend an unbounded amount of time evaluating it. An authenticated user with read-only privileges was able to send a single request that left Kibana unable to serve any user until the process was restarted. This vulnerability impacts Kibana users with read-only privileges.

Defensive priority

Medium-priority defensive review recommended due to potential denial of service via excessive allocation.

Recommended defensive actions

• Review Kibana process configuration to ensure resource limits are in place
• Implement monitoring to detect potential excessive allocation
• Restrict user privileges to prevent unauthorized requests
• Update Kibana to the latest version if available
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

Evidence from official CVE Program record and NIST NVD detail page indicates a potential denial of service vulnerability in Kibana due to excessive allocation. An authenticated user with read-only privileges could send a single request that left Kibana unable to serve any user until the process was restarted. The vulnerability affects Kibana deployments, and defenders should verify affected scope, review compensating controls, and track exceptions.

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.