What’s Vulnerable › Vulnerabilities

CVE-2025-66518: Apache Kyuubi: Unauthorized directory access due to missing path normalization

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-05 · updated 2026-10-07
• Weakness: CWE-27

Description

Any client who can access to Apache Kyuubi Server via Kyuubi frontend protocols can bypass server-side config kyuubi.session.local.dir.allow.list and use local files which are not listed in the config. This issue affects Apache Kyuubi: from 1.6.0 through 1.10.2. Users are recommended to upgrade to version 1.10.3 or upper, which fixes the issue.

Affected products

• Apache Software Foundation Apache Kyuubi: from 1.6.0 before 1.10.3 — fixed in 1.10.3

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Kyuubi 1.10.3. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/xp460bwbyzdhho34ljd4nchyt2fmhodl
• http://www.openwall.com/lists/oss-security/2026/01/05/1

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