CVE-2026-55782: 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 WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp allocates buffers from attacker-controlled 32-bit section and custom-name length fields without validating them against the data present in the file. A tiny crafted module can force multi-gigabyte allocations during listing or extraction through NameSize, Information.Size, and std::string or vector allocation paths, causing memory exhaustion or process termination. 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 2026-07-14.