CVE-2026-81939: SonicWall Network Security Manager Nsm

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

A Zip Slip vulnerability in the SonicWall Network Security Manager (NSM) On-Prem file upload and archive processing functionality allows an attacker to extract files outside the intended destination directory using a specially crafted archive.

Affected products

• SonicWall Network Security Manager Nsm: up to and including 4.3.0

Published 2026-09-04. Last modified 2026-09-08.