CVE-2026-54616: CWE-125: Out-of-bounds Read in M2Team NanaZip
CVE-2026-54616 is a high-severity out-of-bounds read vulnerability in NanaZip, a 7-Zip derivative for Windows. The flaw exists in the Lz4Decode function where improper handling of negative error values from LZ4_decompress_safe leads to an attacker-inflated buffer size. This causes the ReadBlock function to read beyond heap allocations during fragment extraction, potentially leaking adjacent heap memory or crashing the process. The issue affects versions prior to 6.0.1698.0 and is fixed in that stable release.
AI Analysis
Technical Summary
NanaZip versions before 6.0.1698.0 contain an out-of-bounds read vulnerability (CWE-125) in the Lz4Decode function within NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp. The function incorrectly treats only zero return values from LZ4_decompress_safe as errors, ignoring negative error codes. These negative values are cast to unsigned types and truncated, causing the _cachedUnpackBlockSize to be inflated. During fragment extraction, an attacker-controlled inode Offset can exploit this to cause memcpy to read beyond the allocated _cachedBlock heap buffer, potentially exposing adjacent heap memory or causing a crash. The vulnerability is fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.
Potential Impact
An attacker can craft malformed input to trigger an out-of-bounds read, leading to potential exposure of adjacent heap memory contents in extracted files or causing application crashes. The vulnerability does not allow code execution or integrity modification but can result in information disclosure and denial of service.
Mitigation Recommendations
This vulnerability is fixed in NanaZip stable version 6.0.1698.0 and preview version 6.5.1742.0. Users should upgrade to these versions or later to remediate the issue. No other mitigation or workaround is indicated.
CVE-2026-54616: CWE-125: Out-of-bounds Read in M2Team NanaZip
Description
CVE-2026-54616 is a high-severity out-of-bounds read vulnerability in NanaZip, a 7-Zip derivative for Windows. The flaw exists in the Lz4Decode function where improper handling of negative error values from LZ4_decompress_safe leads to an attacker-inflated buffer size. This causes the ReadBlock function to read beyond heap allocations during fragment extraction, potentially leaking adjacent heap memory or crashing the process. The issue affects versions prior to 6.0.1698.0 and is fixed in that stable release.
CVSS v3.1
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
NanaZip versions before 6.0.1698.0 contain an out-of-bounds read vulnerability (CWE-125) in the Lz4Decode function within NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp. The function incorrectly treats only zero return values from LZ4_decompress_safe as errors, ignoring negative error codes. These negative values are cast to unsigned types and truncated, causing the _cachedUnpackBlockSize to be inflated. During fragment extraction, an attacker-controlled inode Offset can exploit this to cause memcpy to read beyond the allocated _cachedBlock heap buffer, potentially exposing adjacent heap memory or causing a crash. The vulnerability is fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.
Potential Impact
An attacker can craft malformed input to trigger an out-of-bounds read, leading to potential exposure of adjacent heap memory contents in extracted files or causing application crashes. The vulnerability does not allow code execution or integrity modification but can result in information disclosure and denial of service.
Mitigation Recommendations
This vulnerability is fixed in NanaZip stable version 6.0.1698.0 and preview version 6.5.1742.0. Users should upgrade to these versions or later to remediate the issue. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-15T20:07:02.184Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8729e3acd9273b49d93230
Added to database: 08/20/2026, 16:22:59 UTC
Last enriched: 08/20/2026, 16:37:11 UTC
Last updated: 08/20/2026, 16:37:30 UTC
Views: 3
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