CVE-2026-42446: NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser
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 ZEALFSV1HEADER structure. This vulnerability is fixed in 6.0.1698.0.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42446?
CVE-2026-42446 is classified as a medium-severity vulnerability due to its potential for leading to information disclosure.
How do I fix CVE-2026-42446?
To fix CVE-2026-42446, update NanaZip to version 6.0.1698.0 or later.
What software is affected by CVE-2026-42446?
CVE-2026-42446 affects NanaZip versions from 5.0.1252.0 up to, but not including, 6.0.1698.0.
What type of vulnerability is CVE-2026-42446?
CVE-2026-42446 is a stack-based out-of-bounds read vulnerability in the ZealFS bitmap parser.
How is CVE-2026-42446 triggered?
CVE-2026-42446 is triggered when opening a specially crafted ZealFS v1 filesystem image.