What’s Vulnerable › Vulnerabilities

CVE-2026-62384: NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-22 · updated 2026-10-14
• Weakness: CWE-22

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.

Affected products

• nltk: from 3.10.0 before 3.10.2 — fixed in 3.10.2

How to fix

Upgrade to a fixed version: nltk 3.10.2. Check the vendor advisory for mitigations.

References

• https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv
• https://www.vulncheck.com/advisories/nltk-framenetcorpusreader-symlink-sandbox-bypass-before
• https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv

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