CVE-2026-55782: CWE-400: Uncontrolled Resource Consumption in M2Team NanaZip
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.
AI Analysis
Technical Summary
CVE-2026-55782 is an uncontrolled resource consumption vulnerability (CWE-400) in NanaZip, a 7-Zip derivative for Windows. The flaw exists in the WebAssembly archive handler (NanaZip.Codecs.Archive.WebAssembly.cpp) where buffers are allocated from attacker-controlled 32-bit section and custom-name length fields without proper validation against the actual file data. This allows a crafted module to trigger excessive memory allocations during archive listing or extraction via manipulated NameSize, Information.Size, and standard string or vector allocations. The vulnerability can lead to memory exhaustion or process termination. The issue is resolved in NanaZip version 6.5.1749.0.
Potential Impact
An attacker can cause NanaZip to allocate excessive amounts of memory by crafting a malicious archive with manipulated size fields. This can result in memory exhaustion or termination of the NanaZip process, leading to denial of service. There is no indication of privilege escalation, code execution, or data corruption. The CVSS score is low (2.4), reflecting limited impact beyond resource exhaustion.
Mitigation Recommendations
This vulnerability is fixed in NanaZip version 6.5.1749.0. Users should upgrade to version 6.5.1749.0 or later to remediate this issue. No other mitigation or workaround is indicated.
CVE-2026-55782: CWE-400: Uncontrolled Resource Consumption in M2Team NanaZip
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.
CVSS v4.0
Score 2.4low
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55782 is an uncontrolled resource consumption vulnerability (CWE-400) in NanaZip, a 7-Zip derivative for Windows. The flaw exists in the WebAssembly archive handler (NanaZip.Codecs.Archive.WebAssembly.cpp) where buffers are allocated from attacker-controlled 32-bit section and custom-name length fields without proper validation against the actual file data. This allows a crafted module to trigger excessive memory allocations during archive listing or extraction via manipulated NameSize, Information.Size, and standard string or vector allocations. The vulnerability can lead to memory exhaustion or process termination. The issue is resolved in NanaZip version 6.5.1749.0.
Potential Impact
An attacker can cause NanaZip to allocate excessive amounts of memory by crafting a malicious archive with manipulated size fields. This can result in memory exhaustion or termination of the NanaZip process, leading to denial of service. There is no indication of privilege escalation, code execution, or data corruption. The CVSS score is low (2.4), reflecting limited impact beyond resource exhaustion.
Mitigation Recommendations
This vulnerability is fixed in NanaZip version 6.5.1749.0. Users should upgrade to version 6.5.1749.0 or later to remediate this issue. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-17T14:40:28.379Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a51295c68715ace43e3b826
Added to database: 07/10/2026, 17:18:20 UTC
Last enriched: 07/18/2026, 15:21:44 UTC
Last updated: 08/24/2026, 10:52:10 UTC
Views: 90
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