CVE-2026-42446
NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 4.4EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
12 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Affected products
M2Team · NanaZipWant to know if your infrastructure is exposed to this?
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