CVE-2026-42443: NanaZip is an open source file archive

Routine

LOW 3.3UPGRADE

CVE-2026-42443 is a low-severity flaw (CVSS 3.3) affecting nanazip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 vulner

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-369
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: m2team

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 20:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

m2team nanazip UPGRADE

Affected: >= 5.0.1252.0 and < 6.0.1698.0

Fixed in: 6.0.1698.0

Safe to downgrade to: a release before 5.0.1252.0

1. Check installed version

apt-cache policy nanazip || rpm -q nanazip || nanazip --version

2. UPGRADE to 6.0.1698.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nanazip

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nanazip

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.1252.0 (Debian / Ubuntu)

apt-cache madison nanazip sudo apt install nanazip=<VERSION_BEFORE_5.0.1252.0> sudo apt-mark hold nanazip

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nanazip sudo dnf downgrade nanazip-<VERSION_BEFORE_5.0.1252.0> sudo dnf versionlock add nanazip

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42443?

nanazip: upgrade to 6.0.1698.0. Exact commands for each OS are on this page.

Is CVE-2026-42443 being exploited?

CVE-2026-42443 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42443 affect?

CVE-2026-42443 affects nanazip. Severity is low (CVSS 3.3). 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 sup

How urgent is CVE-2026-42443?

Priority 13/100. No elevated risk signals yet.

Related CVEs

CVE-2026-44215 MEDIUM 4.4 UPGRADE NanaZip is an open source file archive
CVE-2026-42446 MEDIUM 4.4 UPGRADE NanaZip is an open source file archive
CVE-2026-42355 LOW 3.3 UPGRADE NanaZip is an open source file archive
CVE-2026-42442 LOW 3.3 UPGRADE NanaZip is an open source file archive
CVE-2026-42444 LOW 3.3 UPGRADE NanaZip is an open source file archive

References

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