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Vulnerability record · CVE-2026-65915 · published 22 August 2026

CVE-2026-65915: Nltk improper access control vulnerability

Nltk · Nltk

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.

7.1 CVSS 4.0 High EPSS 0.41% · top 67.4% CWE-284 · Improper access control
7.1CVSS 4.0 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
31 Aug 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-65915), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.