M2Team NanaZip 6.0.1630.0/6.0.1638.0 allocation of resources

Summaryinfo

A vulnerability, which was classified as problematic, has been found in M2Team NanaZip. Affected is an unknown function. The manipulation leads to allocation of resources. This vulnerability is traded as CVE-2026-42444. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in M2Team NanaZip. It has been rated as problematic. This issue affects an unknown functionality. 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. The summary by CVE is:

NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a denial-of-service vulnerability exists in the littlefs filesystem image parser in NanaZip. The handler's Open method reads BlockCount directly from the attacker-controlled superblock without any validation against the actual file size or any upper-bound ceiling, then iterates BlockCount times, allocating a file-path entry per iteration. A crafted 44-byte littlefs image with BlockCount = 0xFFFFFFFF causes ~4 billion heap allocations, exhausting available memory. This vulnerability is fixed in 6.0.1698.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-42444 since 04/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 6.0.1698.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• M2Team

Name

• NanaZip

Version

• 6.0.1630.0
• 6.0.1638.0

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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