CVE-2026-42443

NanaZip: Integer divide-by-zero in NanaZip UFS inode offset calculation

State: Published
Severity: 3.3 Low
Published: May 12, 2026
Updated: May 12, 2026
Reserved: Apr 27, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	3.3 Low	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L	GitHub_M

Weaknesses

CWE-369 Divide By Zero

Affected Products

Product	Versions
NanaZipM2Team	>= 5.0.1250.0, < 6.0.1698.0Affected

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-3x2h-gqqw-g3gm

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