CVE-2026-55782: CWE-400: Uncontrolled Resource Consumption in M2Team NanaZip
NanaZip versions prior to 6.5.1749.0 contain a vulnerability in the WebAssembly archive handler that allows an attacker to cause uncontrolled memory allocation by crafting archive files with maliciously large name and size fields. This can lead to memory exhaustion or process termination during archive listing or extraction. The issue is fixed in version 6.5.1749.0.
AI Analysis
Technical Summary
CVE-2026-55782 is a low-severity vulnerability in NanaZip, a 7-Zip derivative for Windows. The WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp improperly allocates buffers based on attacker-controlled 32-bit section and custom-name length fields without validating them against actual file data. This allows a crafted module to trigger multi-gigabyte memory allocations via NameSize, Information.Size, and standard string or vector allocations, resulting in memory exhaustion or process termination. The vulnerability affects all versions before 6.5.1749.0 and is resolved in that version.
Potential Impact
An attacker can craft a malicious archive that causes NanaZip to allocate excessive memory during archive listing or extraction, potentially leading to denial of service through memory exhaustion or process crashes. There is no indication of code execution or data corruption beyond resource exhaustion.
Mitigation Recommendations
Upgrade NanaZip to version 6.5.1749.0 or later, where this vulnerability is fixed. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory stating the fix in 6.5.1749.0.
CVE-2026-55782: CWE-400: Uncontrolled Resource Consumption in M2Team NanaZip
Description
NanaZip versions prior to 6.5.1749.0 contain a vulnerability in the WebAssembly archive handler that allows an attacker to cause uncontrolled memory allocation by crafting archive files with maliciously large name and size fields. This can lead to memory exhaustion or process termination during archive listing or extraction. The 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 a low-severity vulnerability in NanaZip, a 7-Zip derivative for Windows. The WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp improperly allocates buffers based on attacker-controlled 32-bit section and custom-name length fields without validating them against actual file data. This allows a crafted module to trigger multi-gigabyte memory allocations via NameSize, Information.Size, and standard string or vector allocations, resulting in memory exhaustion or process termination. The vulnerability affects all versions before 6.5.1749.0 and is resolved in that version.
Potential Impact
An attacker can craft a malicious archive that causes NanaZip to allocate excessive memory during archive listing or extraction, potentially leading to denial of service through memory exhaustion or process crashes. There is no indication of code execution or data corruption beyond resource exhaustion.
Mitigation Recommendations
Upgrade NanaZip to version 6.5.1749.0 or later, where this vulnerability is fixed. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory stating the fix in 6.5.1749.0.
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: 07/10/2026, 17:32:59 UTC
Last updated: 07/10/2026, 17:32:59 UTC
Views: 3
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