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Apache OpenNLP DictionaryEntryPersistor Vulnerable to XML External Entity (XXE) via Unsanitized Dictionary Parsing

Type: advisorySource: OSV1 source record

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 SAXParserFactory at class-load time without enabling FEATURE_SECURE_PROCESSING or disabling DTD processing. When create(InputStream, EntryInserter) is invoked, the only feature set on the XMLReader is namespace support — external entity resolution and DOCTYPE declarations remain fully enabled. An attacker who can supply a crafted dictionary file (e.g., a stop-word list or domain dictionary) containing a malicious DOCTYPE declaration can trigger local file disclosure via file:// entity references or server-side request forgery via http:// entity references during SAX parsing, before the application processes a single dictionary entry. This is inconsistent with the project's own XmlUtil.createSaxParser() helper, which correctly sets FEATURE_SECURE_PROCESSING and disallow-doctype-decl and is used by all other XML parsing paths in the codebase. The public Dictionary(InputStream) constructor delegates directly to this method and is the documented API for loading user-supplied dictionaries, making untrusted input a realistic scenario. Mitigation: 2.x users should upgrade to 2.5.9. 3.x users should upgrade to 3.0.0-M3. Users who cannot upgrade immediately should ensure that all dictionary files are sourced from trusted origins and should consider wrapping the Dicti

Announced Source revision 1
Original source ↗

GHSA-4v8g-86x5-3vrc

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:GHSA-4v8g-86x5-3vrc

org.apache.opennlp:opennlp-tools

Source reference: /affected/0/package/name

Affected versions
2.0.0

Source reference: /affected/0/versions

2.1.0

Source reference: /affected/0/versions

2.1.1

Source reference: /affected/0/versions

2.2.0

Source reference: /affected/0/versions

2.3.0

Source reference: /affected/0/versions

2.3.1

Source reference: /affected/0/versions

2.3.2

Source reference: /affected/0/versions

2.3.3

Source reference: /affected/0/versions

2.4.0

Source reference: /affected/0/versions

2.5.0

Source reference: /affected/0/versions

2.5.1

Source reference: /affected/0/versions

2.5.2

Source reference: /affected/0/versions

2.5.3

Source reference: /affected/0/versions

2.5.4

Source reference: /affected/0/versions

2.5.5

Source reference: /affected/0/versions

2.5.6

Source reference: /affected/0/versions

2.5.6.1

Source reference: /affected/0/versions

2.5.7

Source reference: /affected/0/versions

2.5.8

Source reference: /affected/0/versions

Fixed versions
2.5.9

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

org.apache.opennlp:opennlp-tools

Source reference: /affected/1/package/name

Affected versions
3.0.0-M1

Source reference: /affected/1/versions

3.0.0-M2

Source reference: /affected/1/versions

Fixed versions
3.0.0-M3

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

org.apache.opennlp:opennlp-tools

Source reference: /affected/2/package/name

Affected versions
1.5.1-incubating

Source reference: /affected/2/versions

1.5.2-incubating

Source reference: /affected/2/versions

1.5.3

Source reference: /affected/2/versions

1.6.0

Source reference: /affected/2/versions

1.7.0

Source reference: /affected/2/versions

1.7.1

Source reference: /affected/2/versions

1.7.2

Source reference: /affected/2/versions

1.8.0

Source reference: /affected/2/versions

1.8.1

Source reference: /affected/2/versions

1.8.2

Source reference: /affected/2/versions

1.8.3

Source reference: /affected/2/versions

1.8.4

Source reference: /affected/2/versions

1.9.0

Source reference: /affected/2/versions

1.9.1

Source reference: /affected/2/versions

1.9.2

Source reference: /affected/2/versions

1.9.3

Source reference: /affected/2/versions

1.9.4

Source reference: /affected/2/versions

Fixed versions
1.9.5

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "2.0.0"
          },
          {
            "fixed": "2.5.9"
          }
        ]
      }
    ],
    "package": {
      "name": "org.apache.opennlp:opennlp-tools",
      "purl": "pkg:maven/org.apache.opennlp/opennlp-tools",
      "ecosystem": "Maven"
    },
    "versions": [
      "2.0.0",
      "2.1.0",
      "2.1.1",
      "2.2.0",
      "2.3.0",
      "2.3.1",
      "2.3.2",
      "2.3.3",
      "2.4.0",
      "2.5.0",
      "2.5.1",
      "2.5.2",
      "2.5.3",
      "2.5.4",
      "2.5.5",
      "2.5.6",
      "2.5.6.1",
      "2.5.7",
      "2.5.8"
    ],
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4v8g-86x5-3vrc/GHSA-4v8g-86x5-3vrc.json"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "3.0.0-M1"
          },
          {
            "fixed": "3.0.0-M3"
          }
        ]
      }
    ],
    "package": {
      "name": "org.apache.opennlp:opennlp-tools",
      "purl": "pkg:maven/org.apache.opennlp/opennlp-tools",
      "ecosystem": "Maven"
    },
    "versions": [
      "3.0.0-M1",
      "3.0.0-M2"
    ],
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4v8g-86x5-3vrc/GHSA-4v8g-86x5-3vrc.json"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.9.5"
          }
        ]
      }
    ],
    "package": {
      "name": "org.apache.opennlp:opennlp-tools",
      "purl": "pkg:maven/org.apache.opennlp/opennlp-tools",
      "ecosystem": "Maven"
    },
    "versions": [
      "1.5.1-incubating",
      "1.5.2-incubating",
      "1.5.3",
      "1.6.0",
      "1.7.0",
      "1.7.1",
      "1.7.2",
      "1.8.0",
      "1.8.1",
      "1.8.2",
      "1.8.3",
      "1.8.4",
      "1.9.0",
      "1.9.1",
      "1.9.2",
      "1.9.3",
      "1.9.4"
    ],
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4v8g-86x5-3vrc/GHSA-4v8g-86x5-3vrc.json"
    }
  }
]
Related CVEs
CVE-2026-40682

Source reference: /aliases

Publisher severity

critical

Source reference: /database_specific/severity

Event
#71650 · Revision 1
Added to Heist Feed
Publisher date
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