CVE-2026-42442— NanaZip: Null-pointer dereference in NanaZip UFS parser when root inode is a symlink
Possible ATT&CK Techniques 1AI
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-42442
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- https://github.com/M2Team/NanaZip/security/advisories/GHSA-8r4x-fx3w-ph77x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42442
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
- CVE-2026-44215
NanaZip: Heap out-of-bounds write in NanaZip UFS directory p - CVE-2026-42445
NanaZip: Uncontrolled recursion in NanaZip UFS directory tra - CVE-2026-42444
NanaZip: Unbounded resource consumption in NanaZip littlefs - CVE-2026-42443
NanaZip: Integer divide-by-zero in NanaZip UFS inode offset - CVE-2026-42355
NanaZip: Uncontrolled recursion in NanaZip Electron ASAR par
Same vendor: M2Team
- CVE-2026-44215
NanaZip: Heap out-of-bounds write in NanaZip UFS directory p - CVE-2026-42445
NanaZip: Uncontrolled recursion in NanaZip UFS directory tra - CVE-2026-42444
NanaZip: Unbounded resource consumption in NanaZip littlefs - CVE-2026-42443
NanaZip: Integer divide-by-zero in NanaZip UFS inode offset - CVE-2026-42355
NanaZip: Uncontrolled recursion in NanaZip Electron ASAR par
Same weakness: CWE-476
V. Comments for CVE-2026-42442
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