CVE-2026-42444: NanaZip is an open source file archive

Routine

LOW 3.3UPGRADE

CVE-2026-42444 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, a denial-of-service vulnerability exists in the littlefs filesystem image parser in NanaZip. The handler's Open method reads BlockCount directly from the attacker-controlled superblock without any validation against the actual file size or any upper-bound ceiling, then iterates BlockCount times, allocating a file-path entry per iteration. A crafted 44-byte littlefs imag

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 99%)
CISA exploited list	No
Weakness	CWE-770
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-2026-42444?

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

Is CVE-2026-42444 being exploited?

CVE-2026-42444 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-2026-42444 affect?

CVE-2026-42444 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, a denial-of-service vulnerability exists in the littlefs filesystem image parser in NanaZip. The handler's Open method reads BlockCount directly from the attacker

How urgent is CVE-2026-42444?

Priority 12/100. 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-2026-42443 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

References

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