CVE intelligence

CVE-2026-81939

Vulnerability intelligence

Published Sep 4, 2026Sources checked Oct 7, 2026

9.1CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-81939 and is rated Critical severity with a CVSS score of 9.1. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

SonicWall PSIRT Advisories guidance

Vendor revision: Sep 4, 2026

Install the applicable fixed SonicWall release for your product and branch.

Vendor-listed releases

Fixed Product(s): Fixed Versions
Network Security Manager (NSM) On-Prem (VMWare, Hyper-V, Azure and KVM): 4.3.1-R4 and higher versions.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-81939?

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.

Source: NVD