CVE-2026-23904 Apache Kyuubi: Unrestricted access via Kyuubi engine-ui proxy

What is CVE-2026-23904?

CVE-2026-23904 is a high-severity server-side request forgery vulnerability in Apache Kyuubi, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Kyuubi Engine UI proxy accepts a host and port from the request path and proxies HTTP requests to that destination. A remote requester with network access to the proxy can cause the Kyuubi server to send HTTP requests to arbitrary reachable hosts, resulting in SSRF or open-proxy behavior.

This issue affects Apache Kyuubi: from 1.8.0 before 1.12.0.

Users are recommended to upgrade to version 1.12.0, which disables the proxy by default. To restore proxied Engine UI, set kyuubi.frontend.rest.engine.ui.proxy.enabled=true and configure allowed target hosts with kyuubi.frontend.rest.engine.ui.proxy.hosts.

Weakness: CWE-923

Which versions are affected by CVE-2026-23904?

It affects 1 product.

Products include Apache Kyuubi.

How do I fix CVE-2026-23904?

No fix has been published for CVE-2026-23904 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-23904 being exploited?

There is no known exploitation of CVE-2026-23904 in the wild and no public exploit code.

Other vulnerabilities in Apache Kyuubi

• CVE-2026-52680 Apache Kyuubi: REST batch multipart upload path traversal allows controlled file write Critical 9.8
• CVE-2025-66518 Apache Kyuubi: Unauthorized directory access due to missing path normalization High 8.8
• CVE-2026-62391 Apache Kyuubi: kyuubi.session.local.dir.allow.list bypass via unprefixed Spark file-conf aliases High 8.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qvj4-xxw2-22gf.