Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck
CVE-2026-79675NLTK before 3.10.3 JVM Argument Injection via Per-Call Options
Critical 9.8
In plain English
A critical-severity argument injection in nltk from nltk. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.8%top 44.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | nltk | no fix listed | DEBIAN-CVE-2026-79675 |
| Debian:13 | nltk | no fix listed | DEBIAN-CVE-2026-79675 |
| Debian:14 | nltk | 3.10.3-1 | DEBIAN-CVE-2026-79675 |
| PyPI | nltk | 3.10.3 | GHSA-m4rf-3fr8-xwx3 |
| PyPI | nltk | 3.10.3 | PYSEC-2026-3749 |
Affected products (as reported)
Weakness: CWE-88 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Security Advisory (GHSA-m4rf-3fr8-xwx3) vendor-advisory
- VulnCheck Advisory: NLTK before 3.10.3 JVM Argument Injection via Per-Call Options third-party-advisory