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Exploited (KEV)47In CISA KEV
CVSS critical776CVSS 9.0–10.0
CVSS high1543CVSS 7.0–8.9

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Apache records in CISA KEV

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8 records in Opennlp · all components

Priority MEDIUM 53

Untrusted Java Deserialization in Apache OpenNLP SvmDoccatModel Versions Affected: before 3.0.0-M4 (libsvm document categorization module; introduced in OPENNLP-1808 and only present on the 3.x line) Description: SvmDocc…

CVSS 3.1HIGH 7.3 Network No auth No interaction EPSS 0.13921 Published 2026-07-06 Fixed in 3.0.0-M4 CWE-502
Priority MEDIUM 50

The two built-in name-finder patterns exposed by opennlp.tools.namefind.RegexNameFinderFactory - DEFAULT_REGEX_NAME_FINDER.EMAIL and DEFAULT_REGEX_NAME_FINDER.URL - contain ambiguous nested quantifiers.

CVSS 4.0CRITICAL 10.0 Network No auth No interaction EPSS 0.00767 Published 2026-09-11 Fixed in 3.0.0-M6, 2.5.12 CWE-1333
Priority MEDIUM 50

Arbitrary Class Instantiation via Model Manifest in Apache OpenNLP ExtensionLoader Versions Affected: before 1.9.5, before 2.5.9, before 3.0.0-M3 Description: The ExtensionLoader.instantiateExtension(Class, String) metho…

CVSS 3.1CRITICAL 9.8 Network No auth No interaction EPSS 0.00707 Published 2026-05-04 Partial fix · 2.5.9, 3.0.0-M3 +1 CWE-470
Priority MEDIUM 48

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 stati…

CVSS 3.1CRITICAL 9.1 Network No auth No interaction EPSS 0.00495 Published 2026-05-04 Partial fix · 2.5.9, 3.0.0-M3 +1 CWE-611
Priority MEDIUM 48

When loading models or dictionaries that contain XML it is possible to perform an XXE attack, since Apache OpenNLP is a library, this only affects applications that load models or dictionaries from untrusted sources.

CVSS 3.0CRITICAL 9.8 Network No auth No interaction EPSS 0.03041 Published 2017-10-02 Fixed in 1.8.2 CWE-611
Priority MEDIUM 40

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(), getOutco…

CVSS 3.1HIGH 7.5 Network No auth No interaction EPSS 0.00603 Published 2026-05-04 Partial fix · 2.5.9, 3.0.0-M3 +1 CWE-789
Priority LOW 27

Arbitrary Class Instantiation via XML Feature Generator Descriptor and Format Name in Apache OpenNLP Versions Affected: - before 2.5.10 - before 3.0.0-M5 Description: Three code paths in Apache OpenNLP load a class by it…

CVSS 3.1MEDIUM 5.6 Network No auth No interaction EPSS 0.00852 Published 2026-07-24 Partial fix · 3.0.0-M4, 2.5.11 CWE-470
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