What is CVE-2026-42440?

CVE-2026-42440 is a high-severity vulnerability in Apache Opennlp, classified under CWE-789. CVSS score: 7.5/10. Published 2026-05-04.

How severe is CVE-2026-42440?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apache Opennlp

CVE-2026-42440

OOM Denial of Service via Unbounded Array Allocation in Apache OpenNLP AbstractModelReader Versions Affected: before 2.5.9 before 3.0.0-M3 Description: The AbstractModelReader methods getOutcomes(), getOutcomePatterns(), and getPr…

EPSS: 0.002 (40.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

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

Weakness classification (CWE)

CWE-789

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-2026-42440?: CVE-2026-42440 is a high-severity vulnerability in Apache Opennlp, classified under CWE-789. CVSS score: 7.5/10. Published 2026-05-04.
How severe is CVE-2026-42440?: High severity. CVSS v3 base score is 7.5 out of 10.