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NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths usin
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 packages
- nltk— before 3.10.3
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://www.vulncheck.com/advisories/nltk-before-path-traversal-via-symlink-bypass
- https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr
Structured record: https://osv.dev/vulnerability/PYSEC-2026-3737
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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