CVE-2026-42444 Details
Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a denial-of-service vulnerability exists in the littlefs filesystem image parser in NanaZip. The handler's Open method reads BlockCount directly from the attacker-controlled superblock without any validation against the actual file size or any upper-bound ceiling, then iterates BlockCount times, allocating a file-path entry per iteration. A crafted 44-byte littlefs image with BlockCount = 0xFFFFFFFF causes ~4 billion heap allocations, exhausting available memory. This vulnerability is fixed in 6.0.1698.0.
A denial-of-service vulnerability has been identified in NanaZip versions 5.0.1252.0 prior to 6.0.1698.0. The issue arises in the LittleFS filesystem image parser, where the 'Open' method reads 'BlockCount' directly from the superblock without validating it against the actual file size or imposing an upper limit. This oversight allows for exploitation by crafting a 44-byte LittleFS image with a 'BlockCount' of 0xFFFFFFFF, leading to approximately 4 billion heap allocations and exhausting available memory. The vulnerability is triggered during the 'IInArchive::Open()' process, before any user interaction is required.
Users can upgrade to NanaZip version 6.0.1698.0 or later, where this vulnerability has been fixed. For those who cannot upgrade, a workaround is to manually validate the 'BlockSize' and 'BlockCount' values against the actual stream length before processing the LittleFS image.
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 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/M2Team/NanaZip/security/advisories/GHSA-7hqh-mq57-wjmq | CISA-ADP | MitigationVendor Advisory |
| https://github.com/M2Team/NanaZip/security/advisories/GHSA-7hqh-mq57-wjmq | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| m2team nanazip | >= 5.0.1252.0, < 6.0.1698.0 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 18, 2026 | Reanalysis | [email protected] |
| May 18, 2026 | Initial Analysis | [email protected] |
| May 14, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | New CVE Received | [email protected] |