CVE-2026-42443: CWE-369: Divide By Zero in M2Team NanaZip
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, an integer divide-by-zero exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the superblock field fs_ipg (inodes per cylinder group) is set to zero. The parser uses this attacker-controlled value as a divisor without validation, causing an immediate hardware trap and process crash. This vulnerability is fixed in 6.0.1698.0.
AI Analysis
Technical Summary
CVE-2026-42443 is a low-severity integer divide-by-zero vulnerability in the NanaZip open source file archive software. It affects versions from 5.0.1252.0 to before 6.0.1698.0. The flaw exists in the UFS/UFS2 filesystem image parser where the superblock field fs_ipg (inodes per cylinder group) can be set to zero by an attacker. This zero value is used as a divisor without validation, causing a divide-by-zero exception that triggers a hardware trap and crashes the process. This results in a denial of service condition when opening a maliciously crafted UFS image. The vulnerability is resolved in NanaZip version 6.0.1698.0.
Potential Impact
The vulnerability causes a denial of service by crashing the NanaZip process when parsing a specially crafted UFS filesystem image with fs_ipg set to zero. There is no impact on confidentiality or integrity. The CVSS v3.1 base score is 3.3 (low), reflecting the limited impact and the requirement for local access with user interaction to trigger.
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 remediation or temporary fixes are documented. Patch status is confirmed fixed in the stated version.
CVE-2026-42443: CWE-369: Divide By Zero in M2Team NanaZip
Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, an integer divide-by-zero exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the superblock field fs_ipg (inodes per cylinder group) is set to zero. The parser uses this attacker-controlled value as a divisor without validation, causing an immediate hardware trap and process crash. This vulnerability is fixed in 6.0.1698.0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42443 is a low-severity integer divide-by-zero vulnerability in the NanaZip open source file archive software. It affects versions from 5.0.1252.0 to before 6.0.1698.0. The flaw exists in the UFS/UFS2 filesystem image parser where the superblock field fs_ipg (inodes per cylinder group) can be set to zero by an attacker. This zero value is used as a divisor without validation, causing a divide-by-zero exception that triggers a hardware trap and crashes the process. This results in a denial of service condition when opening a maliciously crafted UFS image. The vulnerability is resolved in NanaZip version 6.0.1698.0.
Potential Impact
The vulnerability causes a denial of service by crashing the NanaZip process when parsing a specially crafted UFS filesystem image with fs_ipg set to zero. There is no impact on confidentiality or integrity. The CVSS v3.1 base score is 3.3 (low), reflecting the limited impact and the requirement for local access with user interaction to trigger.
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 remediation or temporary fixes are documented. Patch status is confirmed fixed in the stated version.
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: 6a03813ccbff5d861012f667
Added to database: 5/12/2026, 7:36:28 PM
Last enriched: 5/12/2026, 8:07:57 PM
Last updated: 5/13/2026, 5:03:04 AM
Views: 2
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