CVE-2026-62391 Apache Kyuubi: kyuubi.session.local.dir.allow.list bypass via unprefixed Spark file-conf aliases

High 8.1 Published 31 Jul 2026 Updated 31 Jul 2026

Attackers can bypass local directory allowlist restrictions in Apache Kyuubi via unprefixed Spark config aliases, potentially accessing unauthorized files.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-62391?

CVE-2026-62391 is a high-severity path traversal vulnerability in Apache Kyuubi, published on 31 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-27, CWE-22

Which versions are affected by CVE-2026-62391?

It affects 1 product.

Products include Apache Kyuubi.

How do I fix CVE-2026-62391?

No fix has been published for CVE-2026-62391 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-62391 being exploited?

There is no known exploitation of CVE-2026-62391 in the wild and no public exploit code.

Sources

Also known as GHSA-pp6r-c7gq-g5pr.