How severe is CVE-2026-42446?

CVE-2026-42446 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-42446 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-2026-42446?

CVE-2026-42446 affects M2team Nanazip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42446?

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

Does CVE-2026-42446 have an EU (EUVD) identifier?

Yes. CVE-2026-42446 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29791.

When was CVE-2026-42446 published?

CVE-2026-42446 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-42446

CVE-2026-42446 is a medium-severity vulnerability in M2team Nanazip with a CVSS 3.x base score of 4.4. 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-125.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29791
Weakness: CWE-125
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, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.

Frequently asked questions

What is CVE-2026-42446?: NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.
How severe is CVE-2026-42446?: CVE-2026-42446 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-42446 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-2026-42446?: CVE-2026-42446 affects M2team Nanazip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42446?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42446 have an EU (EUVD) identifier?: Yes. CVE-2026-42446 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29791.
When was CVE-2026-42446 published?: CVE-2026-42446 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9

Affected products (1)

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

More vulnerabilities in M2team Nanazip

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