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VULNERABILITIES

CVE-2026-70626 Details

Description

NLTK versions before 3.9.4 contain a symlink escape vulnerability in CorpusReader.open() that allows local attackers to read arbitrary files outside the corpus root. The vulnerability exists because path validation is lexical and does not account for symlink resolution, enabling attackers to place symlinks inside the corpus root to access files outside the intended boundary.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.2 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9 CISA-ADPExploitVendor Advisory
https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9 [email protected]ExploitVendor Advisory
https://www.vulncheck.com/advisories/nltk-before-symlink-escape-via-corpusreader [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-59Improper Link Resolution Before File Access ('Link Following')[email protected]

Affected Products

ProductVersions
nltk nltk
< 3.9.4

CPE

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

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-70626
NVD Published Date:
Aug 22, 2026
NVD Last Modified:
Aug 31, 2026
Source:
[email protected]
CVE-2026-70626 Details - Not Deferred