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CVE-2026-81939 is a Zip Slip path-traversal vulnerability in the file-upload and archive-processing functionality of SonicWall Network Security Manager (NSM) On-Prem versions 4.3.0 and earlier. Insufficient validation of archive entry pathnames permits a specially crafted archive to extract files outside the intended destination directory.
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A Zip Slip path-traversal vulnerability in SonicWall Network Security Manager (NSM) On-Prem archive upload and processing that permits a crafted archive to extract files outside its intended destination directory.
A Zip Slip path-traversal vulnerability in SonicWall Network Security Manager (NSM) On-Prem archive upload and processing. A specially crafted archive can cause files to be extracted outside the intended destination directory. The listed CVSS v3.1 vector is AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H, and CISA SSVC records exploitation as none, automation as no, and technical impact as total.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.