CVE-2026-41871

Apache Nutch: Unauthenticated reflection-based job execution in Nutch Server (Nutch REST API)

State: Published
Severity: 9.8 Critical
Published: Sep 9, 2026
Updated: Sep 10, 2026
Reserved: Apr 22, 2026

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/ .

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-862 Missing Authorization
CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

Affected Products

Product	Versions
Apache NutchApache Software Foundation	1.10 through 1.22Affected

References

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