CVE-2026-42355: NanaZip is an open source file archive

Routine

LOW 3.3UPGRADE

CVE-2026-42355 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 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.

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-674
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: >= 5.0.1250.0 and < 6.0.1698.0

Fixed in: 6.0.1698.0

Safe to downgrade to: a release before 5.0.1250.0

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 5.0.1250.0 (Debian / Ubuntu)

apt-cache madison nanazip sudo apt install nanazip=<VERSION_BEFORE_5.0.1250.0> 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_5.0.1250.0> 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-2026-42355?

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

Is CVE-2026-42355 being exploited?

CVE-2026-42355 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-2026-42355 affect?

CVE-2026-42355 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 uncontrolled recursion vulnerability exists in the Electron Archive (ASAR) parser in NanaZip. When opening a crafted .asar file with deeply nested JSON in the

How urgent is CVE-2026-42355?

Priority 13/100. No elevated risk signals yet.

Software pages

Electron vulnerabilities

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-2026-42443 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
CVE-2026-42444 LOW 3.3 UPGRADE NanaZip is an open source file archive

References

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