What is CVE-2026-40682?

CVE-2026-40682 is a critical-severity vulnerability in Apache Opennlp, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.1/10. Published 2026-05-04.

How severe is CVE-2026-40682?

Critical severity. CVSS v3 base score is 9.1 out of 10.

XXE in Apache Opennlp

CVE-2026-40682

XML External Entity (XXE) via Unsanitized Dictionary Parsing in Apache OpenNLP DictionaryEntryPersistor Versions Affected: before 2.5.9, before 3.0.0-M3 Description: The DictionaryEntryPersistor class initializes a static SAXParserFact…

Vulnerability class: XXE (XML External Entity)

EPSS: 0.001 (29.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Opennlp — versions 3.0.0
Apache Software Foundation Opennlp — versions 0, 3.0

Weakness classification (CWE)

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

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-40682?: CVE-2026-40682 is a critical-severity vulnerability in Apache Opennlp, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.1/10. Published 2026-05-04.
How severe is CVE-2026-40682?: Critical severity. CVSS v3 base score is 9.1 out of 10.