CVE-2026-70626
NLTK before 3.9.4 Symlink Escape via CorpusReader
CVSS Score
6.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-59 |
| Vendor | nltk |
| Product | nltk |
| Published | Aug 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
nltk / nltk
0 < 3.9.4
References
Credits
🔍 leduckhuong