CVE-2026-55782 (GCVE-0-2026-55782)
Vulnerability from cvelistv5 – Published: 2026-07-10 16:46 – Updated: 2026-07-14 02:00
VLAI
EPSS
VEX
Title
NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 02:00 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/M2Team/NanaZip/security/adviso… | x_refsource_CONFIRM |
| https://github.com/M2Team/NanaZip/commit/1ce90f2d… | x_refsource_MISC |
| https://github.com/M2Team/NanaZip/commit/56aee890… | x_refsource_MISC |
| https://github.com/M2Team/NanaZip/commit/92b12a6e… | x_refsource_MISC |
| https://github.com/M2Team/NanaZip/releases/tag/6.… | x_refsource_MISC |
Impacted products
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"url": "https://github.com/M2Team/NanaZip/commit/92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db6"
},
{
"name": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0",
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}
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"id": "CVE-2026-55782",
"lastModified": "2026-07-14T02:16:56.287",
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"privilegesRequired": "LOW",
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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