CVE-2026-59295 Spring CVE debrief

Who should care

Defenders responsible for maintaining or securing systems that use Micrometer-instrumented clients should assess exposure and prioritize verification and potential mitigations. This includes operators, platform administrators, vulnerability management teams, and security teams. They should verify exposure in their inventory, assess potential impact, and plan for upgrades or mitigations to prevent DoS conditions.

Why it matters

Defenders should care about CVE-2026-59295 because it can cause a denial-of-service (DoS) condition in Micrometer-instrumented clients, potentially impacting system availability. Verification of exposure, assessment of impact, and planning for upgrades or mitigations are necessary.

• Potential DoS conditions may require defensive response and incident handling
• Verification of exposure and impact may require additional monitoring and logging
• Upgrades or mitigations may be necessary to prevent DoS conditions

Technical summary

The vulnerability is caused by an unbounded memory leak in Micrometer-instrumented clients, which can lead to a denial-of-service (DoS) condition. Affected versions include Micrometer 1.17.0, 1.16.0-1.16.6, 1.15.0-1.15.12, 1.14.0-1.14.16, and 1.9.18 and earlier. The memory leak can be exploited by sending specific sequences of HTTP requests, potentially causing system crashes or instability. Defenders should prioritize verifying exposure in their inventory and assessing the impact of potential DoS conditions. Planning for upgrades or mitigations is also crucial to prevent DoS conditions.

Defensive priority

Defenders should prioritize verifying exposure in their inventory, assessing the impact of potential DoS conditions, and planning for upgrades or mitigations.

Recommended defensive actions

• Verify exposure in inventory and assess potential impact
• Plan for upgrades or mitigations
• Monitor for potential DoS conditions
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information from the vendor or other sources may be necessary to fully understand the issue. The unbounded memory leak can be triggered by specific sequences of HTTP requests, and defenders should verify exposure in their inventory and assess potential impact. Additional monitoring and logging may be required to detect potential DoS conditions.

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.