Path Traversal in SonicWall Network Security Manager (Nsm)
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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (51.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000
Affected products
- SonicWall Network Security Manager (Nsm) — versions 4.3.0 and earlier versions
Weakness classification (CWE)
References
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0015 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-81939?
- CVE-2026-81939 is a critical-severity vulnerability in SonicWall Network Security Manager (Nsm), 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.