CVE-2026-81726CWE-73

CVE-2026-81726

High · published August 27, 2026

CVSS v3.1

7.0

EPSS

Percentile

26.1

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.0 · HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
CVSS v4.0: 8.3 · CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS: 0.00339 · 26.1th percentile
Weakness: CWE-73 · External Control of File Name or Path
Published: 2026-08-27T21:21Z

Affected products (1)

Product	Versions	Fixed in
nltk/nltk	< 3.10.3	3.10.3

References (3)

https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp · [email protected]https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis · [email protected]https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp · 134c704f-9b21-4f2e-91b3-4a467353bcc0

EPSS history

Timeline

27 AUG 14:51Z
NLTK through 3.10.3 Path Traversal via Model-Artifact APIs
cvelistv5