CVE-2026-42443

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

CVSS 3.3 LOWEPSS 0.1%CWE-369

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 3.3EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

12 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

M2Team · NanaZip

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References

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