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CVE-2026-81726 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp	CISA-ADP	ExploitVendor Advisory
https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp	[email protected]	ExploitVendor Advisory
https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-73	External Control of File Name or Path	[email protected]

Affected Products

Product	Versions
nltk nltk	< 3.10.3
CPE cpe:2.3:a:nltk:nltk:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Aug 31, 2026	Initial Analysis	[email protected]
Aug 27, 2026	CVE Modified	CISA-ADP
Aug 27, 2026	New CVE Received	[email protected]