Vulnerability in Nltk
CVE-2026-62385
NLTK versions before 3.10.0 contain a path traversal vulnerability in FramenetCorpusReader and NKJPCorpusReader that allows attackers to parse XML files outside the corpus root by supplying unsafe selectors or poisoned index state. Attackers can exploit frame_by_name, doc, lu, and header methods with crafted parameters to read arbitrary XML files accessible to the application.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/nltk/nltk/security/advisories/GHSA-568f-pv23-39p4 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/nltk-path-traversal-via-framenet-and-nkjp-readers (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-62385?
- CVE-2026-62385 is a medium-severity vulnerability in Nltk, classified under External Control of File Name or Path. CVSS score: 5.9/10. Published 2026-08-22.
- How severe is CVE-2026-62385?
- Medium severity. CVSS v3 base score is 5.9 out of 10.