What’s Vulnerable › Vulnerabilities

CVE-2026-44215: NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-787

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.

Affected products

• M2Team NanaZip: from 5.0.1252.0 before 6.0.1698.0 — fixed in 6.0.1698.0

How to fix

Upgrade to a fixed version: M2Team NanaZip 6.0.1698.0. Check the vendor advisory for mitigations.

References

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

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