CVE-2026-79674
HIGHDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 14% of all known CVEs.
References
Related Vulnerabilities
Other CWE-73 (External Control of File Name or Path) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-39952 | Critical | 9.8 | 100% | - | Fix |
| CVE-2024-8517 | Critical | 9.8 | 95% | - | Fix |
| CVE-2025-33053 | High | 8.8 | 85% | KEV | Fix |
| CVE-2024-43451 | Medium | 6.5 | 84% | KEV | Fix |
| CVE-2023-4634 | Critical | 9.8 | 83% | - | Fix |
| CVE-2023-3643 | High | 7.3 | 75% | - | - |
Common questions
How do I fix CVE-2026-79674?
Upgrade nltk on debian unstable to 3.10.3-1 or later.
Is CVE-2026-79674 being actively exploited?
Not that we know of. CVE-2026-79674 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.23% is the estimated probability that it will be exploited in the next 30 days. That is higher than 14% of all scored CVEs.
How severe is CVE-2026-79674?
CVE-2026-79674 has a CVSS v3 base score of 8.2, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-79674 affect?
Published advisories record a fix for nltk (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-28.