NLTK: Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution

Summary The NLTK library's TransitionParser.parse method deserializes model files using pickleload with the default restricted=False parameter, allowing arbitrary Python code execution when loading a malicious model file. The library provides a RestrictedUnpickler class for safe deserialization,...

EUVD-2026-65229

NLTK: Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution...

CVE-2026-78683

NLTK before 3.10.0 affected versions =3.9.4 contains an unsafe pickle deserialization vulnerability in the TransitionParser.parse method nltk/parse/transitionparser.py. The method calls pickleload with the default restricted=False, routing deserialization through WarningUnpickler, which does not...

CVE-2026-78683

NLTK before 3.10.0 affected versions =3.9.4 contains an unsafe pickle deserialization vulnerability in the TransitionParser.parse method nltk/parse/transitionparser.py. The method calls pickleload with the default restricted=False, routing deserialization through WarningUnpickler, which does not...

PT-2026-81158

Name of the Vulnerable Software and Affected Versions NLTK versions prior to 3.10.0 Description An unsafe pickle deserialization issue exists in the TransitionParser.parse function. The function utilizes pickle load with the restricted parameter set to False, which directs deserialization through...