CVE-2026-55783CWE-476

NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive

Low · published July 10, 2026

CVSS v4.0
2.4
EPSS
0%
Percentile
4.7
In the wild
Unconfirmed
What it is

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.

The record
Technical detail
CVSS v4.0
2.4 · LOW
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00159 · 4.7th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-07-10T16:48Z
EPSS history
Timeline
  • 10 JUL 16:48Z
    NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive
    cvelistv5