CVE-2026-65915

MEDIUM 6.5

NLTK before 3.10.0 Arbitrary File Read via FileSystemPathPointer

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.

CWE	CWE-284
Vendor	nltk
Product	nltk
Published	Aug 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

nltk / nltk

0 < 3.10.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nltk/nltk/security/advisories/GHSA-72r2-7mfr-5xr9 vulncheck.com: https://www.vulncheck.com/advisories/nltk-before-arbitrary-file-read-via-filesystempathpointer

Credits

🔍 ZeroXJacks