High 8.9Published Jul 3, 2026

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

Updated under an hour ago (Oct 27, 2026, 1:23 AM ET)

Does this affect you?

It affects Apache Software Foundation Apache Lucene.Net and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Apache Software Foundation Apache Lucene.Net

Exploited in the last 30 days

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.

CVSS: 8.9 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/AU:Y/RE:L
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Analyzed
Record last updated: Jul 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache Lucene.Net apache_software_foundation:apache_lucene.net (from the name)	from 4.8.0-beta00005 before 4.8.0-beta00018	CNA record
apache lucene.net apache:lucene.net	4.8.0; 4.8.0; 4.8.0; 4.8.0; 4.8.0; 4.8.0; 4.8.0; 4.8.0; and 5 more ranges	NVD

References

References

https://lists.apache.org/thread/on1j3zmvgtf8n9fw78z3lyf6dn94p5zc	vendor-advisory, mailing-list
http://www.openwall.com/lists/oss-security/2026/07/03/2	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.