CVE-2026-44215

NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser

State: Published
Severity: 4.4 Medium
Published: May 12, 2026
Updated: May 13, 2026
Reserved: May 5, 2026

Description

NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a one-byte heap out-of-bounds null write exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS filesystem image. The attacker controls the byte offset of the write within a ~254-byte window past the heap allocation boundary. This vulnerability is fixed in 6.0.1698.0.

Scores

CVSS	Score	Vector	Source
3.1	4.4 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L	GitHub_M

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
NanaZipM2Team	>= 5.0.1250.0, < 6.0.1698.0Affected

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-44wh-7gc3-w936

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