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

CVE-2026-42446

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

Description (CNA)

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 (CNA)

Vendor / product	Versions
M2Team / NanaZip	affected >= 5.0.1250.0, < 6.0.1698.0

CWE

CWE-125

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.