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CVE-2026-55781

LOW
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 UFS and FFS image handler in NanaZip.Codecs.Archive.Ufs.cpp validates the superblock block size only against the MINBSIZE lower bound and does not validate the fs_fsize fragment size, allowing attacker-controlled 32-bit fields to flow into indirect-block, directory, and extraction buffer allocations. A tiny crafted UFS image can force multi-gigabyte allocations during open or extraction, causing memory exhaustion or process termination. This issue is fixed in version 6.5.1749.0.

Metadata

CVE ID
CVE-2026-55781
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-17 14:40 UTC
Published
2026-07-10 16:50 UTC
Last updated
2026-07-10 16:50 UTC
Primary CWE
CWE-400
CWE-400: Uncontrolled Resource Consumption
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
Affected products (1)
VendorProductPlatformVersions
M2Team NanaZip — < 6.5.1749.0
Weakness (CWE)
CWESourceDescription
CWE-400 cna CWE-400: Uncontrolled Resource Consumption
CWE-789 cna CWE-789: Memory Allocation with Excessive Size Value
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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