CVE-2026-41871: nutch Auth Bypass — Fix

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/ .

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0078

Probability of exploitation

0.54%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-470 CWE-470

CWE-862 Missing Authorization

Affected Products

Vendor	Product	Versions
apache	nutch	1.10 — 1.23

References

Advisories & Patches

https://lists.apache.org/thread/rbr63fx8vlrhzrfknq2l0mg0d0blsl54

Other References

http://www.openwall.com/lists/oss-security/2026/09/08/5

Frequently Asked Questions

What is CVE-2026-41871? +

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/ . It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-41871? +

CVE-2026-41871 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0078, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-41871? +

CVE-2026-41871 affects products from apache, specifically: nutch. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41871? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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