VULNERABILITY INTELLIGENCE

CVE-2026-71513

CVSS score8.8 HIGH
EPSS probability1.10%
CISA KEVNot currently listed
Published2026-08-22
Last modified2026-10-14
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft untrusted transition-parser models that execute arbitrary commands when TransitionParser.parse loads the model through allowlisted_pickle_load.

Weakness classification

  • disclosure@vulncheck.com: CWE-502

Primary references