# Apache Opennlp vulnerabilities

Source: https://junglewise.ai/threats/technologies/opennlp  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/opennlp.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in Apache Opennlp: 0 in the last 7 days and 1 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-67211, was published on 11 September 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 5 (2 critical, 0 exploited in the wild)

## About Apache Opennlp

Natural language processing library providing tools for text tokenization, segmentation, and linguistic analysis.

## Latest Apache Opennlp vulnerabilities

- [CVE-2026-67211: Apache OpenNLP SymSpellModelSerializer denial of service via unbounded map pre-sizing](https://junglewise.ai/threats/cve-2026-67211-apache-opennlp-symspellmodelserializer-denial-of-service-via) (high, CVSS 7.5, published 11 Sep 2026)
- [CVE-2026-63317: Apache OpenNLP arbitrary class instantiation in XML Feature Generator](https://junglewise.ai/threats/cve-2026-63317-apache-opennlp-arbitrary-class-instantiation-in-xml-feature) (info, CVSS 0, published 24 Jul 2026)
- [CVE-2026-42440: Apache OpenNLP denial of service in AbstractModelReader](https://junglewise.ai/threats/cve-2026-42440-apache-opennlp-denial-of-service-in-abstractmodelreader) (high, CVSS 7.5, published 4 May 2026)
- [CVE-2026-42027: Apache OpenNLP arbitrary class instantiation in ExtensionLoader](https://junglewise.ai/threats/cve-2026-42027-apache-opennlp-arbitrary-class-instantiation-in-extensionloader) (critical, CVSS 9.8, published 4 May 2026)
- [CVE-2026-40682: Apache OpenNLP XXE in DictionaryEntryPersistor](https://junglewise.ai/threats/cve-2026-40682-apache-opennlp-xxe-in-dictionaryentrypersistor) (critical, CVSS 9.1, published 4 May 2026)

## Most severe Apache Opennlp vulnerabilities

- [CVE-2026-42027: Apache OpenNLP arbitrary class instantiation in ExtensionLoader](https://junglewise.ai/threats/cve-2026-42027-apache-opennlp-arbitrary-class-instantiation-in-extensionloader) (critical, CVSS 9.8, published 4 May 2026)
- [CVE-2026-40682: Apache OpenNLP XXE in DictionaryEntryPersistor](https://junglewise.ai/threats/cve-2026-40682-apache-opennlp-xxe-in-dictionaryentrypersistor) (critical, CVSS 9.1, published 4 May 2026)
- [CVE-2026-67211: Apache OpenNLP SymSpellModelSerializer denial of service via unbounded map pre-sizing](https://junglewise.ai/threats/cve-2026-67211-apache-opennlp-symspellmodelserializer-denial-of-service-via) (high, CVSS 7.5, published 11 Sep 2026)
- [CVE-2026-42440: Apache OpenNLP denial of service in AbstractModelReader](https://junglewise.ai/threats/cve-2026-42440-apache-opennlp-denial-of-service-in-abstractmodelreader) (high, CVSS 7.5, published 4 May 2026)
- [CVE-2026-63317: Apache OpenNLP arbitrary class instantiation in XML Feature Generator](https://junglewise.ai/threats/cve-2026-63317-apache-opennlp-arbitrary-class-instantiation-in-xml-feature) (info, CVSS 0, published 24 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 1 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Apache technologies

- [Apache Airflow](https://junglewise.ai/threats/technologies/airflow): 95 vulnerabilities
- [Apache Camel](https://junglewise.ai/threats/technologies/camel): 87 vulnerabilities
- [Apache Tomcat](https://junglewise.ai/threats/technologies/tomcat): 87 vulnerabilities
- [Apache Thrift](https://junglewise.ai/threats/technologies/thrift): 77 vulnerabilities
- [Apache Ofbiz](https://junglewise.ai/threats/technologies/ofbiz): 67 vulnerabilities
- [Apache HTTP Server](https://junglewise.ai/threats/technologies/http-server): 62 vulnerabilities
- [Apache Traffic Server](https://junglewise.ai/threats/technologies/traffic-server): 55 vulnerabilities
- [Apache Brpc](https://junglewise.ai/threats/technologies/brpc): 36 vulnerabilities
- [Apache Roller](https://junglewise.ai/threats/technologies/roller): 30 vulnerabilities
- [Apache CloudStack](https://junglewise.ai/threats/technologies/cloudstack): 28 vulnerabilities
- [Apache ActiveMQ](https://junglewise.ai/threats/technologies/activemq): 27 vulnerabilities
- [Apache Apisix](https://junglewise.ai/threats/technologies/apisix): 27 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Apache Opennlp vulnerabilities", https://junglewise.ai/threats/technologies/opennlp, 12 November 2026.