CVE-2026-55782

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.

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Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-789 CWE-789

References

Other References

https://github.com/M2Team/NanaZip/commit/1ce90f2d14a984476d0407a835273705607facf2 https://github.com/M2Team/NanaZip/commit/56aee89037947410dd5e66f3a087e0f290484bae https://github.com/M2Team/NanaZip/commit/92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db6 https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0 https://github.com/M2Team/NanaZip/security/advisories/GHSA-qxhc-2v6p-wm8m

Frequently Asked Questions

What is CVE-2026-55782? +

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.

How do I check if I'm vulnerable to CVE-2026-55782? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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