Bug 2496984 (CVE-2026-12252) - CVE-2026-12252 nltk: nltk: Arbitrary Code Execution via Untrusted JAR File Loading
Summary: CVE-2026-12252 nltk: nltk: Arbitrary Code Execution via Untrusted JAR File Lo...
Keywords:
Status: NEW
Alias: CVE-2026-12252
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2497246 2497247
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-04 02:01 UTC by OSIDB Bzimport
Modified: 2026-07-06 08:45 UTC (History)
22 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-04 02:01:17 UTC
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.


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