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


- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-h9qj-gx4p-69cp

## What is CVE-2026-52680?

CVE-2026-52680 is a critical vulnerability in Apache Kyuubi, published on 30 Jul 2026. 

### Official 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.

Weakness: CWE-73 (External Control of File Name or Path), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-52680?

It affects 1 product.


Products: Apache Kyuubi.

## How do I fix CVE-2026-52680?

No fix has been published for CVE-2026-52680 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-52680 being exploited?

There is no known exploitation of CVE-2026-52680 in the wild and no public exploit code.

Public exploit code:

- https://github.com/0xdak/CVE-2026-52680_exploit (github_poc): https://github.com/0xdak/CVE-2026-52680_exploit

## Other vulnerabilities in Apache Kyuubi

- [CVE-2025-66518](https://insights.sbomify.com/CVE-2025-66518/): Apache Kyuubi: Unauthorized directory access due to missing path normalization (high 8.8)
- [CVE-2026-62391](https://insights.sbomify.com/CVE-2026-62391/): Apache Kyuubi: kyuubi.session.local.dir.allow.list bypass via unprefixed Spark file-conf aliases (high 8.1)
- [CVE-2026-23904](https://insights.sbomify.com/CVE-2026-23904/): Apache Kyuubi: Unrestricted access via Kyuubi engine-ui proxy (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52680 and fix it if it is affected.

What it is: CVE-2026-52680 is a critical vulnerability in Apache Kyuubi, published on 30 Jul 2026. 
Exploitation: There is no known exploitation of CVE-2026-52680 in the wild and no public exploit code.

Affected product: Apache Kyuubi. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-52680/ (Markdown: https://insights.sbomify.com/CVE-2026-52680/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52680
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52680
- OSV: https://osv.dev/vulnerability/CVE-2026-52680

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-52680/
Summaries are generated and may contain mistakes; the official description above is the record.