CVE-2026-55780 (GCVE-0-2026-55780)
Vulnerability from cvelistv5 – Published: 2026-07-10 16:49 – Updated: 2026-07-13 18:14
VLAI
EPSS
VEX
Title
NanaZip: Uncaught exception / unbounded allocation in NanaZip .NET single-file Extract() via unvalidated entry Size
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 18:14 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/M2Team/NanaZip/security/adviso… | x_refsource_CONFIRM |
| https://github.com/M2Team/NanaZip/commit/ad62e3b4… | x_refsource_MISC |
| https://github.com/M2Team/NanaZip/releases/tag/6.… | x_refsource_MISC |
Impacted products
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"lastModified": "2026-07-13T19:17:15.323",
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"modifiedAttackVector": "NOT_DEFINED",
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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