CVE-2026-62385 NLTK 3.9.4 Path Traversal via FrameNet and NKJP Readers

What is CVE-2026-62385?

CVE-2026-62385 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 3.10.0 contain a path traversal vulnerability in FramenetCorpusReader and NKJPCorpusReader that allows attackers to parse XML files outside the corpus root by supplying unsafe selectors or poisoned index state. Attackers can exploit frame_by_name, doc, lu, and header methods with crafted parameters to read arbitrary XML files accessible to the application.

Weakness: CWE-73

Which versions are affected by CVE-2026-62385?

3 open source packages ship an affected version, including nltk. It affects 1 product.

Products include Nltk Nltk.

How do I fix CVE-2026-62385?

Upgrade nltk to 3.10.0 or later.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-62385 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62385 exists.

Other vulnerabilities in nltk

• CVE-2026-0848 Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading Critical 10.0
• CVE-2025-14009 Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution Critical 10.0
• CVE-2026-78683 NLTK before 3.10.0 Remote Code Execution via Unsafe Pickle Deserialization Critical 9.4
• CVE-2026-79657 NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization Critical 9.3
• CVE-2026-79675 NLTK before 3.10.3 JVM Argument Injection via Per-Call Options Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-62385, ECHO-f179-da91-9130, GHSA-568f-pv23-39p4, MINI-f2h9-p3rh-h3p4, PYSEC-2026-3728, UBUNTU-CVE-2026-62385.