CVE-2026-42446 Details
Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.
A stack-based out-of-bounds read vulnerability has been identified in NanaZip versions 5.0.1252.0 prior to 6.0.1698.0. The issue arises in the ZealFS filesystem image parser when handling crafted ZealFS v1 images. An attacker can exploit this vulnerability by manipulating the BitmapSize field in the file header, causing an unbounded loop that reads beyond the end of a stack-allocated header structure. This exploitation leads to a disclosure of adjacent stack memory, which could include sensitive information such as return addresses and canary values.
Users can upgrade to NanaZip version 6.0.1698.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9 | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| m2team nanazip | >= 5.0.1252.0, < 6.0.1698.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | Initial Analysis | [email protected] |
| May 12, 2026 | New CVE Received | [email protected] |