What is CVE-2026-47898?

CVE-2026-47898 is a critical-severity vulnerability in Apache Lucene.net, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2026-07-03.

How severe is CVE-2026-47898?

Critical severity. CVSS v3 base score is 9.8 out of 10.

XXE in Apache Lucene.net

CVE-2026-47898

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.

Vulnerability class: XXE (XML External Entity)

Published 2026-07-03 · last modified 2026-07-08.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (38.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apache Lucene.net — versions 4.8.0
Apache Software Foundation Lucene.net — versions 4.8.0-beta00005

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

lists.apache.org/thread/7yn9k6sbbsk18yco5y2hszpcf8dst489 (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-47898?: CVE-2026-47898 is a critical-severity vulnerability in Apache Lucene.net, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2026-07-03.
How severe is CVE-2026-47898?: Critical severity. CVSS v3 base score is 9.8 out of 10.