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OpenAdvisories
Low · 2.4 CVE-2026-55782 EUVD-2026-42954

NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields

Published Jul 10, 2026 · Updated Jul 14, 2026 · Assigned by GitHub_M

Description

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

VendorProductAffectedFixed
M2Team NanaZip < 6.5.1749.0 —

References