CVE-2026-62384 NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2
Attackers can read arbitrary XML files outside the corpus root by placing symlinks in the corpus subdirectory, bypassing path validation in NLTK.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-62384?
CVE-2026-62384 is a high-severity path traversal vulnerability in nltk, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NLTK versions before 3.10.2 contain a symlink-based sandbox bypass in FramenetCorpusReader that allows attackers to read arbitrary XML files outside the corpus root. Attackers can place symlinks with names containing no path separators inside the corpus subdirectory, which pass the path validation guard and are resolved to files outside the intended corpus root when accessed via frame_by_name(), _lu_file(), or doc() methods.
Weakness: CWE-22
Which versions are affected by CVE-2026-62384?
3 open source packages ship an affected version, including nltk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nltk PyPI | From 3.10.0 | 3.10.2 |
nltk PyPI | From 3.10.0 | 3.10.2 |
nltk PyPI | From 3.10.0 | 3.10.2 |
Products include Nltk Nltk.
How do I fix CVE-2026-62384?
Upgrade nltk to 3.10.2 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-62384 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62384 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-2026-79675 NLTK before 3.10.3 JVM Argument Injection via Per-Call Options
Sources
Also known as DEBIAN-CVE-2026-62384, GHSA-f833-7jw8-xwrv, PYSEC-2026-3789, UBUNTU-CVE-2026-62384.