CVE-2026-81726

EUVD-2026-67076
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 25.45%
Affected Products (NVD)
VendorProductVersion
nltknltk
𝑥
< 3.10.3
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
nltk
bookworm
postponed
forky
vulnerable
sid
vulnerable
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
nltk
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp
https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis
https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp