Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/M2Team/NanaZip/commit/1ce90f2d14a984476d0407a835273705607facf
- https://github.com/M2Team/NanaZip/commit/56aee89037947410dd5e66f3a087e0f290484ba
- https://github.com/M2Team/NanaZip/commit/92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db
- https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0
- https://github.com/M2Team/NanaZip/security/advisories/GHSA-qxhc-2v6p-wm8m
- https://github.com/M2Team/NanaZip/security/advisories/GHSA-qxhc-2v6p-wm8m
FAQ
What is CVE-2026-55782?
CVE-2026-55782 is a documented vulnerability. 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 ...
How severe is CVE-2026-55782?
CVSS scoring is not yet available for CVE-2026-55782. Check NVD for updates.
Is there a patch for CVE-2026-55782?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.