CVE-2026-79675 NLTK before 3.10.3 JVM Argument Injection via Per-Call Options
Attackers can inject malicious JVM flags via per-call options in NLTK's java function to achieve arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-79675?
CVE-2026-79675 is a critical command injection vulnerability in nltk, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-88
Which versions are affected by CVE-2026-79675?
3 open source packages ship an affected version, including nltk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nltk PyPI | All versions | 3.10.3 |
nltk PyPI | All versions | 3.10.3 |
nltk PyPI | All versions | 3.10.3 |
Products include Nltk Nltk.
How do I fix CVE-2026-79675?
Upgrade nltk to 3.10.3 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-79675 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79675 exists.
Other vulnerabilities in nltk
- CVE-2026-0848 Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading
- CVE-2025-14009 Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution
- CVE-2026-78683 NLTK before 3.10.0 Remote Code Execution via Unsafe Pickle Deserialization
- CVE-2026-79657 NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization
- CVE-2026-79674 NLTK 3.10.2 Path Traversal via corpus-reader constructors
Sources
Also known as DEBIAN-CVE-2026-79675, ECHO-8a7e-a35b-937a, GHSA-m4rf-3fr8-xwx3, MINI-jgg2-5rm8-qmhx, PYSEC-2026-3749, UBUNTU-CVE-2026-79675.