Disclosure summary
NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer._execute and numpy.f2py.crackfortran.myeval through pickle REDUCE to execute arbitrary commands during model or tokenizer artifact loading.
Source-reported weakness categories
CWE-502
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-79657
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| nltk | nltk | * {"versionEndExcluding":"3.10.3"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Exploit, Vendor Advisory
- www.vulncheck.com — Third Party Advisory
- github.com — Exploit, Vendor Advisory
PUBLISHED 2026-08-25T08:16:28-04:00
MODIFIED 2026-10-08T12:17:44-04:00
INGESTED 2026-10-10T20:50:36-04:00