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PYSEC-2026-3749

Quick fix

PYSEC-2026-3749 — nltk: upgrade to the fixed version with the command below.

pip install --upgrade 'nltk>=3.10.3'

Details

NLTK before 3.10.3 fails to validate JVM options passed through the per-call options parameter in the java() function, allowing attackers to inject dangerous JVM flags. Attackers can supply malicious options like -agentpath, -javaagent, or @argfile to Stanford wrapper classes to achieve arbitrary code execution.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/nltk

Introduced in: 0Fixed in: 3.10.3

Fixpip install --upgrade 'nltk>=3.10.3'

References

https://www.vulncheck.com/advisories/nltk-before-jvm-argument-injection-via-per-call-options[ADVISORY]
https://github.com/nltk/nltk/security/advisories/GHSA-m4rf-3fr8-xwx3[EVIDENCE]