AIKIDO-2026-794740
nltk is vulnerable to Improper Link Resolution Before File Access
52
CVE Score
Medium
Improper Link Resolution Before File Access
TL;DR
FramenetCorpusReader and IPIPANCorpusReader open files reached through caller- or corpus-index-supplied names without resolving symbolic links first. A symlink planted inside the corpus directory under a name that contains no path-traversal characters is silently followed, so the reader can open a file located anywhere on the filesystem the process can reach. The fix resolves links before opening corpus files and keeps reads confined to the intended corpus root.
How do I fix this?
Upgrade the nltk library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application uses NLTK's FrameNet or IPI PAN corpus readers on a corpus directory where an untrusted party can place a symbolic link.
Package
Versions
2.0.1 - 3.10.1
Fixed in 3.10.2Background info
nltk is vulnerable to Improper Link Resolution Before File Access in versions 2.0.1 - 3.10.1.
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