CVE-2026-42444

NanaZip: Unbounded resource consumption in NanaZip littlefs parser via attacker-controlled BlockCount

State: Published
Severity: 3.3 Low
Published: May 12, 2026
Updated: May 14, 2026
Reserved: Apr 27, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	3.3 Low	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L	GitHub_M

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
NanaZipM2Team	>= 5.0.1250.0, < 6.0.1698.0Affected

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-7hqh-mq57-wjmq

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.