CVE-2026-42446CWE-125

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

Medium · published May 12, 2026

CVSS v3.1
4.4
EPSS
0%
Percentile
4.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.4 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00157 · 4.4th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-05-12T19:19Z
EPSS history
Timeline
  • 12 MAY 19:19Z
    NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser
    cvelistv5