CVE-2026-79676

Summary

NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open() instead of nltk.pathsec.open(), allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose outside-root content through normal corpus reader methods like channels(), domains(), and synonyms().

Affected Software

Weaknesses

• CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr

References

• https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr
• https://www.vulncheck.com/advisories/nltk-before-path-traversal-via-symlink-bypass

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