CVE-2026-40682— Apache OpenNLP: XXE via Dictionary Parsing in DictionaryEntryPersistor
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I. Basic Information for CVE-2026-40682
Vulnerability Information
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Vulnerability Title
Apache OpenNLP: XXE via Dictionary Parsing in DictionaryEntryPersistor
Source: NVD (National Vulnerability Database)
Vulnerability Description
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 Dictionary(InputStream) constructor with input validation that rejects any XML containing a DOCTYPE declaration before it reaches the parser.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache OpenNLP 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache OpenNLP是Apache基金会的一个自然语言处理工具库。 Apache OpenNLP 2.5.9之前版本和3.0.0-M3之前版本存在代码问题漏洞，该漏洞源于初始化SAXParserFactory时未启用FEATURE_SECURE_PROCESSING或禁用DTD处理，可能导致攻击者通过特制字典文件触发本地文件泄露或服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache OpenNLP | 0 ~ 2.5.9 | - |
II. Public POCs for CVE-2026-40682
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Same Patch Batch · Apache Software Foundation · 2026-05-04 · 17 CVEs total
| CVE-2026-42810 | 9.9 CRITICAL | Apache Polaris: could broaden vended S3 credentials through wildcard-bearing namespace or |
| CVE-2026-42811 | 9.9 CRITICAL | Apache Polaris: could broaden vended GCS credentials through unescaped identifier content |
| CVE-2026-42809 | 9.9 CRITICAL | Apache Polaris: staged table creation could vend storage credentials for unvalidated locat |
| CVE-2026-42812 | 9.9 CRITICAL | Apache Polaris: No protection on `write.metadata.path` |
| CVE-2026-42027 | Apache OpenNLP: Arbitrary Class Instantiation via Model Manifest in ExtensionLoader | |
| CVE-2026-42440 | Apache OpenNLP: OOM DoS via Unbounded Array Allocation in AbstractModelReader | |
| CVE-2026-40563 | Apache Atlas: Script injection allows access to unintended data | |
| CVE-2026-29169 | Apache HTTP Server: mod_dav_lock indirect lock crash | |
| CVE-2026-23918 | Apache HTTP Server: http2: double free and possible RCE on early reset | |
| CVE-2026-33006 | Apache HTTP Server: mod_auth_digest timing attack | |
| CVE-2026-33007 | Apache HTTP Server: mod_authn_socache crash | |
| CVE-2026-33523 | Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status | |
| CVE-2026-33857 | Apache HTTP Server: Off-by-one OOB reads in AJP getter functions | |
| CVE-2026-34032 | Apache HTTP Server: mod_proxy_ajp: Heap Buffer Over-Read Due to Missing Null-Termination C | |
| CVE-2026-34059 | Apache HTTP Server: mod_proxy_ajp: Heap Over-Read and memory disclosure in ajp_parse_data | |
| CVE-2026-24072 | Apache HTTP Server: mod_rewrite elevation of privileges via ap_expr |
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