# CVE-2026-41870: Apache Nutch: Unauthenticated remote code execution (RCE) via JEXL injection in Nutch Server (Nutch REST API)


- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 9 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-45q5-f4p5-jrqm

## What is CVE-2026-41870?

CVE-2026-41870 is a high-severity vulnerability in Apache Nutch, published on 9 Sep 2026. 

### Official description

Missing Authorization, Improper Control of Generation of Code ('Code Injection'), Improper Control of Dynamically-Managed Code Resources, Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Nutch Server  (Nutch REST API).

This issue affects Apache Nutch: from 1.11 through 1.22.

Users are recommended to upgrade to version 1.23, which removes the Nutch Server.
If an upgrade is not possible, user must restrict access to instances running the Nutch Service to trusted users only.
Please, also visit the  Apache Nutch security advisories https://nutch.apache.org/documentation/security/ .

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-913 (Improper Control of Dynamically-Managed Code Resources), CWE-862 (Missing Authorization), CWE-470 (Use of Externally-Controlled Input to Select Classes or Code)

## Which versions are affected by CVE-2026-41870?

It affects 1 product.


Products: Apache Nutch.

## How do I fix CVE-2026-41870?

No fix has been published for CVE-2026-41870 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-41870 being exploited?

There is no known exploitation of CVE-2026-41870 in the wild and no public exploit code.

## Other vulnerabilities in Apache Nutch

- [CVE-2026-41871](https://insights.sbomify.com/CVE-2026-41871/): Apache Nutch: Unauthenticated reflection-based job execution in Nutch Server (Nutch REST API) (critical 9.8)
- [CVE-2016-6809](https://insights.sbomify.com/CVE-2016-6809/): Apache Tika allows Java code execution for serialized objects embedded in MATLAB files (critical 9.8)
- [CVE-2026-41869](https://insights.sbomify.com/CVE-2026-41869/): Apache Nutch: Unauthenticated forced shutdown and job interruption in Nutch Server (Nutch REST API) (critical 9.1)
- [CVE-2021-23901](https://insights.sbomify.com/CVE-2021-23901/): An XML external entity (XXE) injection vulnerability exists in the Nutch DmozParser (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41870 and fix it if it is affected.

What it is: CVE-2026-41870 is a high-severity vulnerability in Apache Nutch, published on 9 Sep 2026. 
Exploitation: There is no known exploitation of CVE-2026-41870 in the wild and no public exploit code.

Affected product: Apache Nutch. 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-2026-41870/ (Markdown: https://insights.sbomify.com/CVE-2026-41870/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41870
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41870
- OSV: https://osv.dev/vulnerability/CVE-2026-41870

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-41870/
Summaries are generated and may contain mistakes; the official description above is the record.