Vulnerability in Nltk
CVE-2026-79675
NLTK before 3.10.3 fails to validate JVM options passed through the per-call options parameter in the java() function, allowing attackers to inject dangerous JVM flags. Attackers can supply malicious options like -agentpath, -javaagent, or @argfile to Stanford wrapper classes to achieve arbitrary code execution.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.5% 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: 0.008 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/nltk/nltk/security/advisories/GHSA-m4rf-3fr8-xwx3 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/nltk-before-jvm-argument-injection-via-per-call-op… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-79675?
- CVE-2026-79675 is a critical-severity vulnerability in Nltk, classified under Argument Injection. CVSS score: 9.8/10. Published 2026-08-25.
- How severe is CVE-2026-79675?
- Critical severity. CVSS v3 base score is 9.8 out of 10.