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PatchSiren cyber security CVE debrief

CVE-2026-42443 M2team CVE debrief

CVE-2026-42443 is a local denial-of-service issue in NanaZip’s UFS/UFS2 filesystem image parser. A crafted UFS image can set the superblock field fs_ipg to zero, and the parser uses that value as a divisor without validation, causing an immediate divide-by-zero trap and process crash. The issue is fixed in NanaZip 6.0.1698.0.

Vendor
M2team
Product
Nanazip
CVSS
LOW 3.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-05-18
Advisory published
2026-05-12
Advisory updated
2026-05-18

Who should care

NanaZip users and administrators, especially on systems that open untrusted UFS/UFS2 images or automate archive and disk-image inspection.

Technical summary

According to the NVD record and linked vendor advisory, NanaZip versions from 5.0.1252.0 to before 6.0.1698.0 contain an integer divide-by-zero in the UFS/UFS2 filesystem image parser. The trigger is a crafted UFS image whose superblock field fs_ipg (inodes per cylinder group) is set to zero. NVD maps the issue to CWE-369 and the listed CVSS vector indicates local access with user interaction and low availability impact only.

Defensive priority

Low. Patch promptly if NanaZip is present on endpoints that may open untrusted UFS images, but this is a crash-only issue with no listed confidentiality or integrity impact.

Recommended defensive actions

  • Upgrade NanaZip to 6.0.1698.0 or later.
  • Restrict or review handling of untrusted UFS/UFS2 disk images until patched.
  • If NanaZip is bundled in another application or package, confirm the bundled version is updated.
  • Use the vendor advisory and NVD record to validate that deployed builds are outside the affected version range.

Evidence notes

The supplied NVD metadata marks the CVE as analyzed and lists vulnerable versions from 5.0.1252.0 through before 6.0.1698.0. The record cites the vendor advisory as a mitigation reference, identifies CWE-369, and provides the CVSS 3.1 vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L, consistent with a local crash caused by divide-by-zero during image parsing.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42443 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42443

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42443 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42443

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.