# CVE-2026-66756: Apache Tika: unpack endpoint in tika-server allows configuration with unsecureFeatures=false

> Attackers can bypass security restrictions in Apache Tika's unpack endpoint to access unauthorized files or resources.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jul 2026
- **Updated:** 30 Jul 2026
- **Also known as:** GHSA-6m77-jgxr-wx9c

## What is CVE-2026-66756?

CVE-2026-66756 is a medium-severity path traversal vulnerability in Apache Tika, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Protection of Alternate Path vulnerability in Apache Tika.

This issue affects Apache Tika: from 4.0.0-alpha-1 before 4.0.0-beta-1.

Users are recommended to upgrade to version 4.0.0-beta-1, which fixes the issue.

Weakness: CWE-424 (Improper Protection of Alternate Path)

## Which versions are affected by CVE-2026-66756?

It affects 1 product.


Products: Apache Tika.

## How do I fix CVE-2026-66756?

No fix has been published for CVE-2026-66756 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66756 being exploited?

There is no known exploitation of CVE-2026-66756 in the wild and no public exploit code.

## Other vulnerabilities in Apache Tika

- [CVE-2019-10088](https://insights.sbomify.com/CVE-2019-10088/): Allocation of Resources Without Limits or Throttling in Apache Tika (high 8.8)
- [CVE-2025-66516](https://insights.sbomify.com/CVE-2025-66516/): Apache Tika has XXE vulnerability (high 8.4)
- [CVE-2025-54988](https://insights.sbomify.com/CVE-2025-54988/): Apache Tika PDF parser module: XXE vulnerability in PDFParser's handling of XFA (high 8.4)
- [CVE-2018-1335](https://insights.sbomify.com/CVE-2018-1335/): Command injection in org.apache.tika:tika-core (high 8.1)
- [CVE-2019-10094](https://insights.sbomify.com/CVE-2019-10094/): Allocation of Resources Without Limits or Throttling in Apache Tika (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66756 and fix it if it is affected.

What it is: CVE-2026-66756 is a medium-severity path traversal vulnerability in Apache Tika, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-66756 in the wild and no public exploit code.

Affected product: Apache Tika. 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-2026-66756/ (Markdown: https://insights.sbomify.com/CVE-2026-66756/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66756
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66756
- OSV: https://osv.dev/vulnerability/CVE-2026-66756

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66756/
Summaries are generated and may contain mistakes; the official description above is the record.