Vulnerability · Published May 12, 2026 · Assigned by GitHub_M

CVE-2026-42443NanaZip: Integer divide-by-zero in NanaZip UFS inode offset calculation

Low 3.3

In plain English

A low-severity security flaw in NanaZip from M2Team. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low

Exploit odds (30 days)0.1%top 96.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
M2Team	NanaZip	>= 5.0.1250.0, < 6.0.1698.0

Weakness: CWE-369 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References

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