CVE-2026-45568: zrok is software for sharing web services, files, and network resources

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-45568 is a critical-severity flaw (CVSS 9.1) affecting zrok. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

zrok is software for sharing web services, files, and network resources. Prior to 2.0.3, zrok's Python SDK ProxyShare Flask proxy route accepts an absolute URL in the request path and passes it to urllib.parse.urljoin, allowing the requested path to replace the configured target host and causing requests.request to return a server-side response from an attacker-chosen URL. This issue is fixed in version 2.0.3.

Why this priority

Critical severity
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	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-16
Last modified	2026-10-24

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

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-16 17:16 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

netfoundry zrok UPGRADE

Affected: >= 0.4.47 and < 2.0.3

Fixed in: 2.0.3

Safe to downgrade to: a release before 0.4.47

1. Check installed version

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

2. UPGRADE to 2.0.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zrok

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 0.4.47 (Debian / Ubuntu)

apt-cache madison zrok sudo apt install zrok=<VERSION_BEFORE_0.4.47> sudo apt-mark hold zrok

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

dnf --showduplicates list zrok sudo dnf downgrade zrok-<VERSION_BEFORE_0.4.47> sudo dnf versionlock add zrok

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-2026-45568?

zrok: upgrade to 2.0.3. Exact commands for each OS are on this page.

Is CVE-2026-45568 being exploited?

CVE-2026-45568 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-2026-45568 affect?

CVE-2026-45568 affects zrok. Severity is critical (CVSS 9.1). zrok is software for sharing web services, files, and network resources. Prior to 2.0.3, zrok's Python SDK ProxyShare Flask proxy route accepts an absolute URL in the request path and passes it to urllib.parse.urljoin, allowing the requeste

How urgent is CVE-2026-45568?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities · Flask vulnerabilities

Related CVEs

CVE-2026-45576 HIGH 7.5 UPGRADE zrok is software for sharing web services, files, and network resources

References

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