Resource exhaustion in Apache Opennlp
CVE-2026-42440
OOM Denial of Service via Unbounded Array Allocation in Apache OpenNLP AbstractModelReader Versions Affected: before 1.9.5 before 2.5.9 before 3.0.0-M3 Description: The AbstractModelReader methods getOutcomes(), getOutcomePatterns…
EPSS: 0.006 (46.0th 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 2.0, 3.0, 0
Weakness classification (CWE)
References
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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.