Quick answers
- Is CVE-2026-41871 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-41871 being exploited in the wild.
- How severe is CVE-2026-41871?
- Critical severity, with a CVSS score of 9.8, published 9 September 2026.
- Which products and versions are affected?
- Apache Nutch 1.10 through 1.22.
- Is there a fix for CVE-2026-41871?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-41871 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-41871?
- Check whether you run Apache Nutch at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a missing authorization and unsafe reflection flaw in the Nutch REST API (Nutch Server). An attacker can supply externally-controlled input to select and instantiate arbitrary Java classes through the API, bypassing authentication mechanisms. No user interaction or authentication is required; the attacker can trigger code execution directly by sending crafted HTTP requests to the REST endpoint. The vulnerability allows remote code execution (RCE), enabling full system compromise. Version 1.23 removes the Nutch Server entirely; for earlier versions, access restriction to trusted networks is required as a temporary mitigation.
Affected products
- Apache Nutch 1.10 through 1.22
Timeline
- 2026-09-09: disclosed
- 2026-09-08: advisory: Apache Nutch security advisory published