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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% 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 before 4.8.0-beta00018. 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/on1j3zmvgtf8n9fw78z3lyf6dn94p5zc
http://www.openwall.com/lists/oss-security/2026/07/03/2

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