PYSEC-2026-2085

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...

UBUNTU-CVE-2026-12243

NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue 3504. The UNSAFENOPROTOCOLRE regex in nltk/data.py checks for literal ../ sequences but fails to account for percent-encoded traversal sequences such as ..%2f. The url2pathname function decodes...

📄 NLTK 3.9.2 Path Traversal / File Disclosure

NLTK version 3.9.2 suffers from a path traversal vulnerability that allows for file disclosure. ================================================================================================================================== | Title : NLTK 3.9.2 Path Traversal - File Disclosure Exploit | | Auth...

01os (=0.0.14), aa-rag (>=0.4.2 <=0.4.3) +928 more potentially affected by CVE-2026-33231 via nltk (>=2.0.4 <=3.9.3)

nltk PYPI version =2.0.4, =0.4.2, =0.2.3, =0.2.0, =0.0.4, =0.0.1, =0.1.0, =0.1.0, =0.0.9, =0.1.0 and more Source cves: CVE-2026-33231 Source advisory: OSV:GHSA-JM6W-M3J8-898G...

EUVD-2026-10351

A vulnerability in the filestring function of the nltk.util module in nltk version 3.9.2 allows arbitrary file read due to improper validation of input paths. The function directly opens files specified by user input without sanitization, enabling attackers to access sensitive system files by...