CVE-2026-55782
NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields
CVSS Score
0.0
EPSS Score
0.1%
EPSS Percentile
2th
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.
| CWE | CWE-400 CWE-789 |
| Vendor | m2team |
| Product | nanazip |
| Published | Jul 10, 2026 |
| Last Updated | Jul 14, 2026 |
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Affected Versions
M2Team / NanaZip
< 6.5.1749.0
References
github.com: https://github.com/M2Team/NanaZip/security/advisories/GHSA-qxhc-2v6p-wm8m github.com: https://github.com/M2Team/NanaZip/commit/1ce90f2d14a984476d0407a835273705607facf2 github.com: https://github.com/M2Team/NanaZip/commit/56aee89037947410dd5e66f3a087e0f290484bae github.com: https://github.com/M2Team/NanaZip/commit/92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db6 github.com: https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0