CVE-2026-42446

MEDIUM

NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser

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 stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.

References (1)

Core 1
Core References

Scores

CVSS v3 4.4
EPSS 0.0012
EPSS Percentile 2.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (2)
m2team/nanazip 5.0.1252.0 - 6.0.1698.0
M2Team/NanaZip >= 5.0.1250.0, < 6.0.1698.0
Published May 12, 2026
Tracked Since May 13, 2026