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CVE-2026-42442— NanaZip: Null-pointer dereference in NanaZip UFS parser when root inode is a symlink

Quick assessment

Affected
M2Team NanaZip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NanaZip是M2-Team开源的一个压缩软件。 NanaZip 5.0.1252.0版本至6.0.1698.0之前版本存在代码问题漏洞，该漏洞源于UFS/UFS2文件系统镜像解析器无条件将根inode视为目录而不检查其类型，当根inode为符号链接且嵌入目标较小时，目录数据缓冲区长度为零，可能导致空指针取消引用。

CVSS 3.3 · Low EPSS 0.15% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
M2Team NanaZip >= 5.0.1250.0, < 6.0.1698.0 affected
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I. Basic Information for CVE-2026-42442

Vulnerability Information
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Vulnerability Title
NanaZip: Null-pointer dereference in NanaZip UFS parser when root inode is a symlink
Source: CVE Program / CVE List V5
Vulnerability Description
NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
NanaZip 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NanaZip是M2-Team开源的一个压缩软件。 NanaZip 5.0.1252.0版本至6.0.1698.0之前版本存在代码问题漏洞，该漏洞源于UFS/UFS2文件系统镜像解析器无条件将根inode视为目录而不检查其类型，当根inode为符号链接且嵌入目标较小时，目录数据缓冲区长度为零，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
M2Team NanaZip >= 5.0.1250.0, < 6.0.1698.0 -

II. Public POCs for CVE-2026-42442

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III. Intelligence Information for CVE-2026-42442

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Vendor Advisories for CVE-2026-42442 (1)

Same Patch Batch · M2Team · 2026-05-12 · 7 CVEs total

CVE-2026-42446 4.4 MEDIUM NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser
CVE-2026-44215 4.4 MEDIUM NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser
CVE-2026-42355 3.3 LOW NanaZip: Uncontrolled recursion in NanaZip Electron ASAR parser causes stack exhaustion
CVE-2026-42444 3.3 LOW NanaZip: Unbounded resource consumption in NanaZip littlefs parser via attacker-controlled
CVE-2026-42443 3.3 LOW NanaZip: Integer divide-by-zero in NanaZip UFS inode offset calculation
CVE-2026-42445 3.3 LOW NanaZip: Uncontrolled recursion in NanaZip UFS directory traversal causes stack exhaustion

IV. Related Vulnerabilities

Same product: NanaZip
Same vendor: M2Team
Same weakness: CWE-476

V. Comments for CVE-2026-42442

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