What is CVE-2026-81939?

CVE-2026-81939 is a critical-severity vulnerability, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-09-04.

How severe is CVE-2026-81939?

Critical severity. CVSS v3 base score is 9.1 out of 10.

CVE-2026-81939

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.

Vulnerability class: Path Traversal (Directory Traversal)

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-22 — Path Traversal

References

PSIRT@sonicwall.com

Frequently asked questions

What is CVE-2026-81939?: CVE-2026-81939 is a critical-severity vulnerability, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-09-04.
How severe is CVE-2026-81939?: Critical severity. CVSS v3 base score is 9.1 out of 10.