CVE-2026-40983 Spring CVE debrief

Who should care

Defenders and security teams using Micrometer, especially in versions 1.16.0 through 1.16.5 and 1.15.0 through 1.15.11, should assess exposure and prioritize verification and potential updates.

Why it matters

CVE-2026-40983 is a denial-of-service vulnerability in Micrometer that defenders should prioritize verifying and mitigating, especially for versions 1.16.0 through 1.16.5 and 1.15.0 through 1.15.11, to prevent potential service disruption.

• Potential disruption of service due to DoS vulnerability
• Need for verification of Micrometer version and exposure
• Prioritization of security updates for affected versions
• Monitoring for potential gRPC-based attacks

Technical summary

A vulnerability in Micrometer allows for a denial-of-service (DoS) condition through specially crafted gRPC requests. The affected versions are Micrometer 1.16.0 through 1.16.5 and 1.15.0 through 1.15.11. This issue can lead to potential service disruption and defenders should prioritize verifying exposure in Micrometer deployments and assess the need for updates or mitigations. The CVE record and NVD entry provide details on the vulnerability, which could lead to a denial-of-service (DoS) condition via specially crafted gRPC requests.

Defensive priority

Defenders should prioritize verifying exposure in Micrometer deployments, especially for versions 1.16.0 through 1.16.5 and 1.15.0 through 1.15.11, and assess the need for updates or mitigations.

Recommended defensive actions

• Verify Micrometer version and assess exposure
• Review and apply security updates for affected Micrometer versions
• Monitor for potential DoS attacks
• Consider implementing compensating controls for gRPC requests
• Review security advisories for additional guidance
• Inventory affected Micrometer deployments for prioritized remediation
• Track remediation progress and verify fixes

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in Micrometer, which could lead to a denial-of-service (DoS) condition via specially crafted gRPC requests. Affected versions are Micrometer 1.16.0 through 1.16.5 and 1.15.0 through 1.15.11.

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.