CVE-2026-55782CWE-400CWE-789

NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields

Low · published July 10, 2026

CVSS v4.0
2.4
EPSS
0%
Percentile
4.9
In the wild
Unconfirmed
What it is

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp allocates buffers from attacker-controlled 32-bit section and custom-name length fields without validating them against the data present in the file. A tiny crafted module can force multi-gigabyte allocations during listing or extraction through NameSize, Information.Size, and std::string or vector allocation paths, causing memory exhaustion or process termination. This issue is fixed in version 6.5.1749.0.

The record
Technical detail
CVSS v4.0
2.4 · LOW
Vector
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
EPSS
0.00161 · 4.9th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-07-10T16:46Z
EPSS history
Timeline
  • 10 JUL 16:46Z
    NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields
    cvelistv5