CVE-2026-81726 in NLTK

Summary

by MITRE • 08/27/2026

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.

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• Responsible: VulnCheck
• Reservation: 08/27/2026
• Disclosure: 08/27/2026
• Moderation: accepted
• Entry: VDB-396211
• CPE: ready
• CWE: CWE-22 (confirmed)
• CVSS: 7.0 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-81726
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81726
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-81726/