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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-22

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.

Affected products

Apache Software Foundation Apache Lucene.Net: 4.8.0-beta00005, 4.8.0-beta00006, 4.8.0-beta00007, 4.8.0-beta00008, 4.8.0-beta00009, 4.8.0-beta00010 (+7)

References

https://lists.apache.org/thread/7y9gbt17p55fh1zltks4pnh719wq9sqt
http://www.openwall.com/lists/oss-security/2026/07/03/1

Get alerted when CVE-2026-47896 or the next vulnerability affects your stack