CVE-2026-55782 M2Team CVE debrief

Who should care

Users of NanaZip versions prior to 6.5.1749.0 should update to the latest version to prevent potential memory exhaustion attacks. This includes operators, platform administrators, vulnerability management teams, and security teams who use NanaZip.

Technical summary

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.

Defensive priority

Medium

Recommended defensive actions

• Update NanaZip to version 6.5.1749.0 or later
• Restrict access to NanaZip's WebAssembly archive handler
• Monitor NanaZip logs for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-10T17:17:00.017Z and has not been modified since then. The NVD entry is currently Deferred. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability affects NanaZip versions prior to 6.5.1749.0.

Official resources