CVE-2026-52680 Apache Software Foundation CVE debrief

Who should care

Apache Kyuubi users, administrators, and security teams should be aware of this critical vulnerability and take immediate action to upgrade to version 1.12.0. Additionally, operators, platform administrators, and vulnerability management teams should review their deployments and ensure proper mitigations are in place. Security teams should monitor for suspicious activity and review logs for exposed assets that need extra review. Asset inventory and change management processes should also be reviewed to ensure proper tracking and remediation of affected systems.

Technical summary

The Apache Kyuubi REST batch multipart upload handling uses the client-supplied multipart filename when creating a temporary uploaded resource. A remote attacker who can access the REST batch upload endpoint can provide path traversal sequences in the filename and cause the Kyuubi server process to write controlled content outside the intended upload directory, subject to filesystem permissions. This issue can lead to arbitrary file writes, potentially allowing for code execution or data tampering.

Defensive priority

Apache Kyuubi users should prioritize upgrading to version 1.12.0 to address the critical vulnerability.

Recommended defensive actions

• Upgrade Apache Kyuubi to version 1.12.0
• Review and adjust filesystem permissions for the Kyuubi server process
• Monitor for suspicious activity on the REST batch upload endpoint
• 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-2026-52680 issue affects Apache Kyuubi from version 1.7.0 through 1.11.1. Users are recommended to upgrade to version 1.12.0, which fixes the issue. Evidence is limited; further verification is recommended. Additional verification tasks include reviewing filesystem permissions, monitoring for suspicious activity, and ensuring the Kyuubi server process is properly configured.

Official resources