CVE-2026-79676
NLTK before 3.10.3 Path Traversal via Symlink Bypass
HIGH 8.2EPSS 0.4%
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
- nltk
- CVSS v4.0 VULNCHECK
- 8.2 HIGH
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v4.0 GitHub
- 8.2 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS v3.1 VULNCHECK
- 5.9 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS
- 0.45% chance of exploitation in the next 30 days, 37th percentile
- Published
- 2026-08-25
Proof-of-concept exploits (1)
Security advisories
- nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr
- https://www.vulncheck.com/advisories/nltk-before-path-traversal-via-symlink-bypass