M2Team NanaZip up to 6.5.1748.0 WebAssembly Archive NanaZip.Codecs.Archive.WebAssembly.cpp allocation of resources

Summaryinfo

A vulnerability described as problematic has been identified in M2Team NanaZip up to 6.5.1748.0. Affected by this vulnerability is an unknown functionality of the file NanaZip.Codecs.Archive.WebAssembly.cpp of the component WebAssembly Archive Handler. Such manipulation leads to allocation of resources. This vulnerability is traded as CVE-2026-55782. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in M2Team NanaZip up to 6.5.1748.0 and classified as problematic. Affected by this issue is an unknown code block of the file NanaZip.Codecs.Archive.WebAssembly.cpp of the component WebAssembly Archive Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55782 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 6.5.1749.0 eliminates this vulnerability.

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Productinfo

Vendor

• M2Team

Name

• NanaZip

Version

• 6.5.1748

Website

• Product: https://github.com/M2Team/NanaZip/

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