CVE-2026-42444: CWE-770: Allocation of Resources Without Limits or Throttling in M2Team NanaZip
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.
AI Analysis
Technical Summary
CVE-2026-42444 is a resource exhaustion vulnerability in NanaZip's littlefs filesystem image parser. The Open method reads the BlockCount field directly from an attacker-controlled superblock without validation or limits, leading to excessive heap allocations when BlockCount is set to a very large value (0xFFFFFFFF). This causes memory exhaustion and denial of service. The vulnerability affects NanaZip versions from 5.0.1252.0 up to but not including 6.0.1698.0. The issue is resolved in version 6.0.1698.0.
Potential Impact
An attacker can cause NanaZip to exhaust system memory by supplying a crafted littlefs image with an extremely large BlockCount value. This results in denial of service due to resource exhaustion. There is no impact on confidentiality or integrity, only availability is affected. No known exploits are reported in the wild.
Mitigation Recommendations
This vulnerability is fixed in NanaZip version 6.0.1698.0. Users should upgrade to this version or later to remediate the issue. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor's versioning information.
CVE-2026-42444: CWE-770: Allocation of Resources Without Limits or Throttling in M2Team NanaZip
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.
CVSS v3.1
Score 3.3low
Affected software
pkg:github/m2team/NanaZipRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42444 is a resource exhaustion vulnerability in NanaZip's littlefs filesystem image parser. The Open method reads the BlockCount field directly from an attacker-controlled superblock without validation or limits, leading to excessive heap allocations when BlockCount is set to a very large value (0xFFFFFFFF). This causes memory exhaustion and denial of service. The vulnerability affects NanaZip versions from 5.0.1252.0 up to but not including 6.0.1698.0. The issue is resolved in version 6.0.1698.0.
Potential Impact
An attacker can cause NanaZip to exhaust system memory by supplying a crafted littlefs image with an extremely large BlockCount value. This results in denial of service due to resource exhaustion. There is no impact on confidentiality or integrity, only availability is affected. No known exploits are reported in the wild.
Mitigation Recommendations
This vulnerability is fixed in NanaZip version 6.0.1698.0. Users should upgrade to this version or later to remediate the issue. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-27T13:55:58.692Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a03813ccbff5d861012f66a
Added to database: 05/12/2026, 19:36:28 UTC
Last enriched: 05/20/2026, 18:43:06 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 48
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