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CVE-2026-55783

LOW Exploitation: PoC
2.4
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-55783
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-17 14:40 UTC
Published
2026-07-10 16:48 UTC
Last updated
2026-07-10 18:38 UTC
Primary CWE
CWE-476
CWE-476: NULL Pointer Dereference
Vendor / Product
M2Team / NanaZip
Sources
cve.org  ·  NVD

Severity & Metrics

2.4 LOW CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
M2Team NanaZip — < 6.5.1749.0
Weakness (CWE)
CWESourceDescription
CWE-476 cna CWE-476: NULL Pointer Dereference
CVSS scores (1)
ScoreSeverityVersionSourceVector
2.4 LOW 4.0 cna 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
References (3)
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