CVE-2026-81726

NLTK through 3.10.3 Path Traversal via Model-Artifact APIs

HIGH
7
CVSS Score
Published: August 27, 2026 at 02:51 PM UTC
Updated: October 30, 2026 at 11:17 AM UTC
1 product affected across 1 vendorNltk

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Severity
HIGH7
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.10.3
Affected range stops below 3.10.3, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 3.10.4 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHVulnCheck
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-73

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