What’s Vulnerable › Vulnerabilities

CVE-2026-52680: Apache Kyuubi: REST batch multipart upload path traversal allows controlled file write

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-23
• Weakness: CWE-22

Description

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 affects Apache Kyuubi: from 1.7.0 through 1.11.1. Users are recommended to upgrade to version 1.12.0, which fixes the issue.

Affected products

• Apache Software Foundation Apache Kyuubi: from 1.7.0 before 1.12.0 — fixed in 1.12.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Kyuubi 1.12.0. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/b0qx2v8k5v4rrqsh53pb146t7so0lmrk
• http://www.openwall.com/lists/oss-security/2026/07/30/5

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