CVE-2026-47898: Apache Lucene.Net: XXE vulnerability in Lucene.Net.Analysis.Common PatternParser

[Paul Irwin <paulirwin () apache org>]

Severity: 

Affected versions:

- Apache Lucene.Net (Lucene.Net.Analysis.Common) 4.8.0-beta00005 before 4.8.0-beta00018

Description:

Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Lucene.Net.Analysis.Common 
library).

This issue affects Apache Lucene.Net.Analysis.Common: 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-2026-47898