CVE-2026-109956 NLTK - Path Traversal

NLTK through 3.10.3 contains a path traversal vulnerability caused by unvalidated model paths in WekaClassifier, letting attackers write or probe files outside allowed data roots, exploit requires control over model_filename or model argument.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.32% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write, File System Read
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-22

Vendor fix

Update to a version later than 3.10.3 or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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