Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

Skip to content
cve.new Create a CVE report
Check your stack
CVE-2026-81726high8.3

NLTK through 3.10.3 Path Traversal via Model-Artifact APIs

Impact

NLTK through version 3.10.3 has a path traversal vulnerability in model-artifact APIs, allowing attackers to read or write files outside allowed sandbox roots. This occurs when pathsec is enabled and attackers use TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs. Attackers must have access to these APIs to exploit the vulnerability.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

nltk · VulnCheck

nltk

2 ranges
VulnCheck version evidence

Package identity

pkg:pypi/nltkExplore nltk →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 3.10.3

semver versions

unaffected

3.10.4

semver versions

unknown

Other versions: unaffected

Original source 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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-81726

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-73 ↗

External Control of File Name or Path

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*

Through (inclusive): 3.10.3

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "3.10.3"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-08-27

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

2 sources
github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp
vendor-advisoryVulnCheck · CISA-ADP
www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis
third-party-advisoryVulnCheck