Apache Kyuubi up to 1.11.x Spark Config Alias kyuubi.session.local.dir.allowlist access control

Summaryinfo

A vulnerability identified as critical has been detected in Apache Kyuubi up to 1.11.x. Affected is an unknown function of the component Spark Config Alias Handler. Performing a manipulation of the argument kyuubi.session.local.dir.allowlist results in access control. This vulnerability is known as CVE-2026-62391. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Apache Kyuubi up to 1.11.x. This affects some unknown functionality of the component Spark Config Alias Handler. The manipulation of the argument kyuubi.session.local.dir.allowlist with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The security fix for CVE-2025-66518 is incomplete. Any client who can access to Apache Kyuubi Server via Kyuubi frontend protocols can bypass server-side config kyuubi.session.local.dir.allowlist via unprefixed Spark config aliases. This issue affects Apache Kyuubi: from 1.6.0 before 1.12.0. Users are recommended to upgrade to version 1.12.0, which fixes the issue.

The advisory is shared at lists.apache.org. This vulnerability is uniquely identified as CVE-2026-62391 since 07/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/31/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 1.12.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-51518). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Apache

Name

• Kyuubi

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11

License

• open-source

Website

• Vendor: https://www.apache.org/

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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