CVE-2026-41871

CRITICAL CVSS 3.1: 9.8 EPSS 0.74%
Updated Sep 10, 2026
Apache
Parameter Value
CVSS 9.8 (CRITICAL)
Affected Versions 1.10 — 1.23
Fixed In 1.23
Type CWE-470, CWE-862 (Missing Authorization)
Vendor Apache
Public PoC No

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/ .

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Apache Nutch
cpe:2.3:a:apache:nutch:*:*:*:*:*:*:*:*
1.10 1.23