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CVE-2026-12252

HIGH
7.8
CVSS 3.0
Description
In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulnerable to untrusted JAR code execution. These classes accept user-controllable JAR paths and execute them via the `java()` function, which invokes `subprocess.Popen()` without integrity verification. This vulnerability is identical to CVE-2026-0848, which was fixed for StanfordSegmenter by adding SHA256 verification. However, the fix was not applied to these additional classes, leaving them susceptible to arbitrary code execution when loading untrusted JAR files.

Metadata

CVE ID
CVE-2026-12252
State
PUBLISHED
Assigner
@huntr_ai
Reserved
2026-06-15 08:33 UTC
Published
2026-07-04 00:58 UTC
Last updated
2026-07-04 00:58 UTC
Primary CWE
CWE-94
CWE-94 Improper Control of Generation of Code
Vendor / Product
nltk / nltk/nltk
Sources
cve.org  ·  NVD

Severity & Metrics

7.8 HIGH CVSS 3.0
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products (1)
VendorProductPlatformVersions
nltk nltk/nltk — unspecified ≤ latest
Weakness (CWE)
CWESourceDescription
CWE-94 cna CWE-94 Improper Control of Generation of Code
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.8 HIGH 3.0 cna CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References (1)
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