CVE-2026-42442

LOW

NanaZip: Null-pointer dereference in NanaZip UFS parser when root inode is a symlink

Title source: cna
STIX 2.1

Description

NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.

References (1)

Core 1
Core References

Scores

CVSS v3 3.3
EPSS 0.0011
EPSS Percentile 1.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (2)
m2team/nanazip 5.0.1250.0 - 6.0.1698.0
M2Team/NanaZip >= 5.0.1250.0, < 6.0.1698.0
Published May 12, 2026
Tracked Since May 13, 2026