CVE-2026-44215CWE-787

NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser

Medium · published May 12, 2026

CVSS v3.1
4.4
EPSS
0%
Percentile
17.2
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 one-byte heap out-of-bounds null write exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS filesystem image. The attacker controls the byte offset of the write within a ~254-byte window past the heap allocation boundary. 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:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00263 · 17.2th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-05-12T19:23Z
EPSS history
Timeline
  • 12 MAY 19:23Z
    NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser
    cvelistv5