CVE-2026-55780
LOW
INFO
Priority: 0.01
BB Relevance:
20/100
Published: 2026-07-10
Modified: 2026-10-25
First seen: 2026-10-29
Status: active
Attack Surface
Low Complexity
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
Passive
S:
X
AT:
None
VC:
None
VI:
None
VA:
Low
Description
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.