CVE-2026-102477 Eclipse Foundation CVE debrief

Who should care

Defenders responsible for Eclipse Vert.x deployments, particularly those using the io.vertx:vertx-gprc-server component, should assess exposure and prioritize patching or mitigation.

Why it matters

CVE-2026-102477 is a high-severity vulnerability in Eclipse Vert.x that allows for compression bomb attacks, potentially leading to denial-of-service conditions. Defenders should prioritize verification of affected versions, apply patches or mitigations, and monitor for potential exploitation attempts.

• Potential denial-of-service conditions due to compression bomb attacks
• Need for verification of affected versions and configurations
• Prioritization of patching or mitigation efforts
• Monitoring for potential exploitation attempts

Technical summary

The vulnerability is caused by the improper handling of compressed gRPC messages in Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0]. This allows for compression bomb attacks, potentially leading to denial-of-service conditions. The impacted component is io.vertx:vertx-gprc-server. Defenders should prioritize verification of affected versions and apply patches or mitigations to prevent potential compression bomb attacks. Affected product context and defensive impact should be considered.

Defensive priority

Defenders should prioritize verification of affected versions and apply patches or mitigations to prevent potential compression bomb attacks.

Recommended defensive actions

• Verify affected versions of Eclipse Vert.x and apply patches or mitigations
• Review and update configurations for gRPC endpoints to prevent compression bomb attacks
• Monitor for potential exploitation attempts
• 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
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on exploitation or impact is limited. Defenders should verify affected versions and configurations, and monitor for potential exploitation attempts. The source detail is limited, so explicit evidence-limit language and defensive verification tasks are necessary.

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.