High 7.0Published Aug 27, 2026

CVE-2026-81726NLTK through 3.10.3 Path Traversal via Model-Artifact APIs

Updated under an hour ago (2026-10-19 06:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness (CWE): CWE-73
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Aug 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nltk nltk nltk:nltk (from the name)	through 3.10.3	CNA record
nltk nltk nltk:nltk	before 3.10.3	NVD

References

https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xpvendor-advisory, exploit
https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apisthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.