CVE-2026-42443CWE-369

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

Low · published May 12, 2026

CVSS v3.1
3.3
EPSS
0%
Percentile
3.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.3 · LOW
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00148 · 3.7th percentile
Weakness
CWE-369 · Divide By Zero
Published
2026-05-12T19:21Z
EPSS history
Timeline
  • 12 MAY 19:21Z
    NanaZip: Integer divide-by-zero in NanaZip UFS inode offset calculation
    cvelistv5