CVE-2026-42446: CWE-125: Out-of-bounds Read in M2Team NanaZip
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.
AI Analysis
Technical Summary
CVE-2026-42446 is a stack-based out-of-bounds read vulnerability in the ZealFS filesystem image parser component of NanaZip, an open source file archiver. The flaw exists in versions from 5.0.1252.0 to before 6.0.1698.0. It is triggered by opening a crafted ZealFS v1 filesystem image where the attacker controls the BitmapSize field in the file header. This causes an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure, potentially leading to information disclosure or application instability. The issue is resolved in NanaZip version 6.0.1698.0.
Potential Impact
The vulnerability allows an attacker to cause an out-of-bounds read when opening a malicious ZealFS v1 filesystem image. This can lead to limited information disclosure and application availability impact (crash or instability). There is no indication of privilege escalation or code execution. The CVSS score of 4.4 reflects a medium severity with local attack vector and user interaction required.
Mitigation Recommendations
This vulnerability is fixed in NanaZip version 6.0.1698.0. Users should upgrade to this version or later to remediate the issue. No other official mitigation or temporary fix is documented. Patch status is confirmed by the vendor advisory stating the fix is included in version 6.0.1698.0.
CVE-2026-42446: CWE-125: Out-of-bounds Read in M2Team NanaZip
Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42446 is a stack-based out-of-bounds read vulnerability in the ZealFS filesystem image parser component of NanaZip, an open source file archiver. The flaw exists in versions from 5.0.1252.0 to before 6.0.1698.0. It is triggered by opening a crafted ZealFS v1 filesystem image where the attacker controls the BitmapSize field in the file header. This causes an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure, potentially leading to information disclosure or application instability. The issue is resolved in NanaZip version 6.0.1698.0.
Potential Impact
The vulnerability allows an attacker to cause an out-of-bounds read when opening a malicious ZealFS v1 filesystem image. This can lead to limited information disclosure and application availability impact (crash or instability). There is no indication of privilege escalation or code execution. The CVSS score of 4.4 reflects a medium severity with local attack vector and user interaction required.
Mitigation Recommendations
This vulnerability is fixed in NanaZip version 6.0.1698.0. Users should upgrade to this version or later to remediate the issue. No other official mitigation or temporary fix is documented. Patch status is confirmed by the vendor advisory stating the fix is included in version 6.0.1698.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-27T13:55:58.693Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a03813fcbff5d861012f6e6
Added to database: 5/12/2026, 7:36:31 PM
Last enriched: 5/12/2026, 8:07:29 PM
Last updated: 5/13/2026, 5:00:38 AM
Views: 2
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