PT-2026-57235 · M2Team · Nanazip

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-55780

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 .NET single-file bundle handler in NanaZip.Codecs.Archive.DotNetSingleFile.cpp sizes its extraction buffer from the bundle entry Size field, which is only checked for sign and is not validated against the real file size. A crafted bundle can cause an attacker-chosen allocation inside Extract, where std::bad alloc or std::length error can escape across the COM STDMETHODCALLTYPE boundary and crash the process. This issue is fixed in version 6.5.1749.0.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-248

CWE-400

Related Identifiers

CVE-2026-55780

Affected Products

Nanazip

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-55780 · Security Note
• https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0 · Note
• https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72 · Note
• https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a · Note