CVE-2026-55780

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.

CVSS v4.0

2.4 LOWCVSS:4.0/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

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-07-10

Updated

2026-07-13

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52652

References

• CVE Record
• NVD entry

Related

• CVE-2026-5578
• CVE-2026-5579
• CVE-2026-5577
• CVE-2026-55790
• CVE-2026-55764
• CVE-2026-55793