Is CVE-2026-81726 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-81726?

CVE-2026-81726 has a CVSS v3 severity of HIGH (7).

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CVE-2026-81726

Description

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.