CVE-2026-62384
NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2
- State
- Published
- Severity
- 8.7 High
- Published
- Aug 22, 2026
- Updated
- Aug 24, 2026
- Reserved
- Jul 13, 2026
Description
NLTK versions before 3.10.2 contain a symlink-based sandbox bypass in FramenetCorpusReader that allows attackers to read arbitrary XML files outside the corpus root. Attackers can place symlinks with names containing no path separators inside the corpus subdirectory, which pass the path validation guard and are resolved to files outside the intended corpus root when accessed via frame_by_name(), _lu_file(), or doc() methods.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
| Product | Versions |
|---|---|
nltknltk |
|
References
- GitHub Security Advisory (GHSA-f833-7jw8-xwrv)vendor-advisory
- VulnCheck Advisory: NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2third-party-advisory
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