CVE-2026-55780

Summary

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's .NET single-file bundle handler in NanaZip.Codecs.Archive.DotNetSingleFile.cpp sizes its extraction buffer from the bundle entry Size field, which is only checked for sign and is not validated against the real file size. A crafted bundle can cause an attacker-chosen allocation inside Extract, where std::bad_alloc or std::length_error can escape across the COM STDMETHODCALLTYPE boundary and crash the process. This issue is fixed in version 6.5.1749.0.

Affected Software

Weaknesses

• CWE-248: CWE-248: Uncaught Exception
• CWE-400: CWE-400: Uncontrolled Resource Consumption

References

• https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72
• https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a
• https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0

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