CVE-2026-47896 Apache Lucene.Net: Unauthenticated arbitrary file read on the Lucene.Net.Replicator replication server

High 8.9 Published 3 Jul 2026 Updated 6 Jul 2026

An unauthenticated attacker can read arbitrary files from the server via path traversal in the Lucene.Net.Replicator library.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-47896?

CVE-2026-47896 is a high-severity path traversal vulnerability in Apache Lucene.Net, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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 through 4.8.0-beta00017.

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

Weakness: CWE-22

Which versions are affected by CVE-2026-47896?

It affects 1 product.

Products include Apache Lucene.net.

How do I fix CVE-2026-47896?

No fix has been published for CVE-2026-47896 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-47896 being exploited?

There is no known exploitation of CVE-2026-47896 in the wild and no public exploit code.

Sources

Also known as GHSA-mggp-f2j5-mm3g.