CVE-2026-102467 Eclipse Foundation CVE debrief

Who should care

Defenders responsible for Vert.x deployments, especially in network-facing applications or services, should assess exposure and take mitigation actions. This includes operators, platform administrators, vulnerability management teams, and security teams who manage Vert.x environments.

Why it matters

CVE-2026-102467 is a high-severity vulnerability in Eclipse Vert.x that can be exploited for DDOS attacks. Defenders should assess exposure, prioritize patching, and implement compensating controls.

• Potential for DDOS attacks using zip bomb
• Need for patching or mitigating affected Vert.x versions
• Importance of monitoring WebSocket activity for suspicious behavior

Technical summary

The Eclipse Vert.x WebSocket implementation does not define a maximum number of bytes allocation when decompressing frames or messages, allowing for DDOS attacks using a zip bomb. Affected versions include [4.0.0, 4.5.34], [5.0.0, 5.0.12], [5.1.0, 5.1.9], and 5.2.0. The impacted component is io.vertx:vertx-core. This issue affects various versions of Vert.x, specifically those that do not define a maximum number of bytes allocation when decompressing frames or messages in the WebSocket implementation. Defenders should assess exposure and prioritize patching or mitigating this vulnerability.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where Vert.x is used in network-facing applications or services.

Recommended defensive actions

• Assess exposure and apply patches or updates to affected Vert.x versions
• Implement compensating controls, such as rate limiting or traffic filtering, to mitigate potential DDOS attacks
• Monitor for suspicious WebSocket activity and adjust security configurations as needed
• 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 details on the vulnerability, including its description, CVSS score, and affected versions. Vendor advisories are also available for reference. The impacted component is io.vertx:vertx-core. Defenders should verify affected scope and vendor guidance. Limited source detail is provided, so explicit evidence limits apply.

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.