Vulnerability in Nltk
CVE-2026-79674
NLTK versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors that allows attackers to read files outside the intended data root. Attackers can supply arbitrary corpus root paths to LinThesaurusCorpusReader and PanLexLiteCorpusReader constructors to access filesystem content and SQLite databases outside the pathsec sandbox boundary.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/nltk/nltk/security/advisories/GHSA-3gq4-3j92-5w49 (Exploit, vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/nltk-path-traversal-via-corpus-reader-constructors (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-79674?
- CVE-2026-79674 is a high-severity vulnerability in Nltk, classified under External Control of File Name or Path. CVSS score: 8.2/10. Published 2026-08-25.
- How severe is CVE-2026-79674?
- High severity. CVSS v3 base score is 8.2 out of 10.