CVE-2025-66945: A path traversal vulnerability exists in the ZIP extraction API of Zdir Pro 4.x

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-66945 is a critical-severity flaw (CVSS 9.1) affecting zdir. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A path traversal vulnerability exists in the ZIP extraction API of Zdir Pro 4.x. When a crafted ZIP archive is processed by the backend at /api/extract, files may be written outside the intended directory, leading to arbitrary file overwrite and potentially remote code execution

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-03-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zdir

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-03 20:16 UTCPublished CVE record published
2026-06-17 09:57 UTCUpdated Record last modified

zdir zdir UPGRADE

Affected: >= 4.1.1 and <= 4.6.2

Fixed in: newer than 4.6.2

Safe to downgrade to: a release before 4.1.1

1. Check installed version

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

2. UPGRADE to newer than 4.6.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zdir

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 4.1.1 (Debian / Ubuntu)

apt-cache madison zdir sudo apt install zdir=<VERSION_BEFORE_4.1.1> sudo apt-mark hold zdir

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

dnf --showduplicates list zdir sudo dnf downgrade zdir-<VERSION_BEFORE_4.1.1> sudo dnf versionlock add zdir

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-2025-66945?

zdir: upgrade to newer than 4.6.2. Exact commands for each OS are on this page.

Is CVE-2025-66945 being exploited?

CVE-2025-66945 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-2025-66945 affect?

CVE-2025-66945 affects zdir. Severity is critical (CVSS 9.1). A path traversal vulnerability exists in the ZIP extraction API of Zdir Pro 4.x. When a crafted ZIP archive is processed by the backend at /api/extract, files may be written outside the intended directory, leading to arbitrary file overwrit

How urgent is CVE-2025-66945?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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