How severe is CVE-2026-42355?

CVE-2026-42355 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-42355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42355?

CVE-2026-42355 affects M2team Nanazip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42355?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42355 have an EU (EUVD) identifier?

Yes. CVE-2026-42355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29786.

When was CVE-2026-42355 published?

CVE-2026-42355 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-42355

CVE-2026-42355 is a low-severity vulnerability in M2team Nanazip with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29786
Weakness: CWE-674
Affected product: M2team Nanazip
Published: 2026-05-12
Last modified: 2026-06-17

Description

NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, an uncontrolled recursion vulnerability exists in the Electron Archive (ASAR) parser in NanaZip. When opening a crafted .asar file with deeply nested JSON in the header, both nlohmann::json::parse and the handler's GetAllPaths function recurse without depth limits, exhausting the thread stack and crashing the NanaZip process. This vulnerability is fixed in 6.0.1698.0.

Frequently asked questions

What is CVE-2026-42355?: NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, an uncontrolled recursion vulnerability exists in the Electron Archive (ASAR) parser in NanaZip. When opening a crafted .asar file with deeply nested JSON in the header, both nlohmann::json::parse and the handler's GetAllPaths function recurse without depth limits, exhausting the thread stack and crashing the NanaZip process. This vulnerability is fixed in 6.0.1698.0.
How severe is CVE-2026-42355?: CVE-2026-42355 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-42355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42355?: CVE-2026-42355 affects M2team Nanazip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42355?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42355 have an EU (EUVD) identifier?: Yes. CVE-2026-42355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29786.
When was CVE-2026-42355 published?: CVE-2026-42355 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-4gxf-p4q6-gfrf

Affected products (1)

cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:*

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CVE-2026-27710 — Medium (CVSS 5.0): NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to versions 6.0.1638.0 and 6.5.1638.0,…

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