HOMEVULNERABILITIESCVE-2026-42443
MEDIUM

CVE-2026-42443

CWE-369Published: May 12, 2026· Updated: May 18, 2026

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.3th

Official Description

NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, an integer divide-by-zero exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the superblock field fs_ipg (inodes per cylinder group) is set to zero. The parser uses this attacker-controlled value as a divisor without validation, causing an immediate hardware trap and process crash. This vulnerability is fixed in 6.0.1698.0.

NVD Source

Technical Analysis

CVE-2026-42443 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

m2team1 product
nanazip
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/M2Team/NanaZip/security/advisories/GHSA-3x2h-gqqw-g3gm

All References (1)

→
https://github.com/M2Team/NanaZip/security/advisories/GHSA-3x2h-gqqw-g3gmMitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-42443
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-369
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMay 12, 2026

Related CVEs (CWE-369)

CVE-2026-46470
9.1
CVE-2026-25799
7.5
CVE-2026-31884
7.5
CVE-2026-5747
7.5
CVE-2026-35215
7.5
CVE-2026-42209
6.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-42443 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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