CVE-2026-47897: Apache Lucene.Net: Arbitrary file write from malicious server to Lucene.Net.Replicator client

[Paul Irwin <paulirwin () apache org>]

Severity: 

Affected versions:

- Apache Lucene.Net (Lucene.Net.Replicator) 4.8.0-beta00005 before 4.8.0-beta00018

Description:

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Apache Lucene.Net 
(Lucene.Net.Replicator library).

This issue affects Apache Lucene.Net.Replicator: from 4.8.0-beta00005 before 4.8.0-beta00018.

Users are recommended to upgrade to version 4.8.0-beta00018, which fixes the issue.

Credit:

Daniel Cervera (reporter)
Paul Irwin (coordinator)
Shad Storhaug (remediation reviewer)

References:

https://lucenenet.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-47897