CVE-2026-42444
NanaZip: Unbounded resource consumption in NanaZip littlefs parser via attacker-controlled BlockCount
CVSS Score
3.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | m2team |
| Product | nanazip |
| Published | May 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
M2Team / NanaZip
>= 5.0.1250.0, < 6.0.1698.0