Path traversal in model-artifact APIs bypasses pathsec
Author: prasadayushCreated Sep 16, 2026Updated Sep 16, 2026
Summary
NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.
CVE: CVE-2026-81726 | Affected: ≤ 3.10.3 | Fixed version: None yet
Base Score - 7 HIGH for CVSS Version 3.x
Can you please share the fix plan and ETA for a patched release?
Source: nltk/nltk