PT-2026-57237 · M2Team · Nanazip

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-55782

Mitre

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

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-789

CWE-400

Related Identifiers

CVE-2026-55782

Affected Products

Nanazip

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-55782 · Security Note
• https://github.com/M2Team/NanaZip/commit/92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db6 · Note
• https://github.com/M2Team/NanaZip/commit/56aee89037947410dd5e66f3a087e0f290484bae · Note
• https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0 · Note
• https://github.com/M2Team/NanaZip/commit/1ce90f2d14a984476d0407a835273705607facf2 · Note
• https://github.com/M2Team/NanaZip/security/advisories/GHSA-qxhc-2v6p-wm8m · Note