PT-2026-57238 · M2Team · Nanazip

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-55783

NVD

CVSS v4.0

2.4

Low

Base vector

AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-55783

Affected Products

Nanazip

References · 4

• 🔥 https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-55783 · Security Note
• https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0 · Note
• https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894 · Note