NLTK: Default ENFORCE=False Disables All pathsec Security Controls

NLTK's pathsec.py security module defaults to ENFORCE=False line 24, which means all 8 security validation functions only emit RuntimeWarning instead of raising exceptions when violations are detected. The pathsec module was introduced as the fix for CVE-2024-39705 arbitrary code execution via...

Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data.load) defeats ENFORCE mode

Summary nltk.pathsec provides an SSRF filter that NLTK documents as a security control, blocking loopback, private, link-local, and multicast ranges including obfuscated forms and recommending strict ENFORCE mode for security-sensitive environments. The filter is bypassable by DNS rebinding:...

Server-side Request Forgery (SSRF)

Overview nltk is a Natural Language Toolkit NLTK is a Python package for natural language processing. Affected versions of this package are vulnerable to Server-side Request Forgery SSRF through the urlopen process in nltk.pathsec. An attacker can reach loopback or internal HTTP services by...