CVE-2026-42446 MEDIUM

CVE-2026-42446: NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser

Vendor M2Team
Product NanaZip
Weakness CWE-125
Published May 12, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

4.4/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated