CVE-2026-42442: CWE-476: NULL Pointer Dereference in M2Team NanaZip
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.
AI Analysis
Technical Summary
NanaZip, an open-source file archiver, contains a null-pointer dereference vulnerability in its UFS/UFS2 filesystem image parser in versions >= 5.0.1252.0 and < 6.0.1698.0. The vulnerability occurs when the root inode (inode 2) in a crafted UFS image is set to IFLNK (symlink) rather than IFDIR (directory). The parser assumes the root inode is always a directory and does not verify its type. If the symlink has an embedded target with a small di_size, the directory data buffer is zero-length, causing a null-pointer dereference upon the first read attempt. This flaw can cause the application to crash. The vulnerability is addressed in NanaZip version 6.0.1698.0.
Potential Impact
The vulnerability results in a denial of service condition by causing NanaZip to crash when processing a specially crafted UFS image. There is no impact on confidentiality or integrity. The CVSS score of 3.3 reflects a low severity with local attack vector, low complexity, no privileges required, and user interaction needed.
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. There is no vendor advisory indicating alternative mitigations or that no action is required. Patch status is confirmed by the version information in the description.
CVE-2026-42442: CWE-476: NULL Pointer Dereference in M2Team NanaZip
Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
NanaZip, an open-source file archiver, contains a null-pointer dereference vulnerability in its UFS/UFS2 filesystem image parser in versions >= 5.0.1252.0 and < 6.0.1698.0. The vulnerability occurs when the root inode (inode 2) in a crafted UFS image is set to IFLNK (symlink) rather than IFDIR (directory). The parser assumes the root inode is always a directory and does not verify its type. If the symlink has an embedded target with a small di_size, the directory data buffer is zero-length, causing a null-pointer dereference upon the first read attempt. This flaw can cause the application to crash. The vulnerability is addressed in NanaZip version 6.0.1698.0.
Potential Impact
The vulnerability results in a denial of service condition by causing NanaZip to crash when processing a specially crafted UFS image. There is no impact on confidentiality or integrity. The CVSS score of 3.3 reflects a low severity with local attack vector, low complexity, no privileges required, and user interaction needed.
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. There is no vendor advisory indicating alternative mitigations or that no action is required. Patch status is confirmed by the version information in the description.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-27T13:55:58.692Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a03813ccbff5d861012f664
Added to database: 5/12/2026, 7:36:28 PM
Last enriched: 5/12/2026, 8:08:06 PM
Last updated: 5/13/2026, 4:51:53 AM
Views: 3
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