CVE-2026-41871 Apache Nutch: Unauthenticated reflection-based job execution in Nutch Server (Nutch REST API)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-41871?
CVE-2026-41871 is a critical vulnerability in Apache Nutch, published on 9 Sep 2026.
Official description
Missing Authorization, 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 1.10 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/ .
Which versions are affected by CVE-2026-41871?
It affects 1 product.
Products include Apache Nutch.
How do I fix CVE-2026-41871?
No fix has been published for CVE-2026-41871 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-41871 being exploited?
There is no known exploitation of CVE-2026-41871 in the wild and no public exploit code.
Other vulnerabilities in Apache Nutch
- CVE-2016-6809 Apache Tika allows Java code execution for serialized objects embedded in MATLAB files
- CVE-2026-41869 Apache Nutch: Unauthenticated forced shutdown and job interruption in Nutch Server (Nutch REST API)
- CVE-2021-23901 An XML external entity (XXE) injection vulnerability exists in the Nutch DmozParser
- CVE-2026-41870 Apache Nutch: Unauthenticated remote code execution (RCE) via JEXL injection in Nutch Server (Nutch REST API)
Sources
Also known as GHSA-5w4f-vwv7-mj4c.