CVE-2026-55783: m2team Nanazip

Low severity, CVSS 2.4. EPSS: 0.2% chance of exploitation in the next 30 days.

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.

Affected products

• m2team Nanazip: before 6.5.1749.0 (fixed in 6.5.1749.0)

Published 2026-07-10. Last modified 2026-07-10.