What’s Vulnerable › Vulnerabilities
CVE-2026-42446: NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-12 · updated 2026-10-26
- Weakness: CWE-125
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.
Affected products
- M2Team NanaZip: from 5.0.1252.0 before 6.0.1698.0 — fixed in 6.0.1698.0
How to fix
Upgrade to a fixed version: M2Team NanaZip 6.0.1698.0. Check the vendor advisory for mitigations.
References
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