CVE Explorer
CVE-2026-63317
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 its fully-qualified name via Class.forName() and invoke its no-arg constructor without any prior validation of the class name or its type.
The affected paths are:
(1) GeneratorFactory, which reads the class attribute of generator elements in an XML feature generator descr
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"collectionURL":"https://repo.maven.apache.org/maven2/","defaultStatus":"unaffected","packageName":"org.apache.opennlp:opennlp-tools","product":"Apache OpenNLP","vendor":"Apache Software Foundation","versions":[{"lessThan":"3.0.0-M4","status":"affected","version":"3.0.0-M1","versionType":"semver"},{"lessThan":"2.5.11","status":"affected","version":"0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:537a59ad153b2fff076b5518dc79e1ecfa492ed4873a0b8fa2d865f2e7787baf · sha256:9543ec7a61339ee7… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:537a59ad153b2fff076b5518dc79e1ecfa492ed4873a0b8fa2d865f2e7787baf · sha256:9543ec7a61339ee7… · /containers/adp/1/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-470","description":"CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:537a59ad153b2fff076b5518dc79e1ecfa492ed4873a0b8fa2d865f2e7787baf · sha256:9543ec7a61339ee7… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/07/24/7"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:537a59ad153b2fff076b5518dc79e1ecfa492ed4873a0b8fa2d865f2e7787baf · sha256:9543ec7a61339ee7… · /containers/adp/0/references/0
{"tags":["vendor-advisory"],"url":"https://lists.apache.org/thread/myr446n8t3gv8gq8wbpxm41olx16d8yj"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:537a59ad153b2fff076b5518dc79e1ecfa492ed4873a0b8fa2d865f2e7787baf · sha256:9543ec7a61339ee7… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.