CVE-2026-40302: zrok is software for sharing web services, files, and network resources

Q: How do I fix CVE-2026-40302?

zrok: upgrade to 2.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-40302 being exploited?

CVE-2026-40302 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40302 affect?

CVE-2026-40302 affects zrok. Severity is medium (CVSS 6.1). zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template (which performs no HTML escaping) instead of html/template. The GitHub OAuth callback handl

Q: How urgent is CVE-2026-40302?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-40302 is a medium-severity flaw (CVSS 6.1) 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 version 2.0.1, the proxyUi template engine uses Go's text/template (which performs no HTML escaping) instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the attacker-controlled refreshInterval query parameter verbatim into an error message when time.ParseDuration fails, and render that error unescaped into HTML. An

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-79, CWE-116
Published	2026-04-17
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-04-17 21:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

netfoundry zrok UPGRADE

Affected: < 2.0.1

Fixed in: 2.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.0.1 (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.

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-2026-40302?

zrok: upgrade to 2.0.1. Exact commands for each OS are on this page.

Is CVE-2026-40302 being exploited?

CVE-2026-40302 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-2026-40302 affect?

CVE-2026-40302 affects zrok. Severity is medium (CVSS 6.1). zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template (which performs no HTML escaping) instead of html/template. The GitHub OAuth callback handl

How urgent is CVE-2026-40302?

Priority 24/100. No elevated risk signals yet.

Software pages

GitHub vulnerabilities

Related CVEs

CVE-2026-40303 HIGH 7.5 UPGRADE zrok is software for sharing web services, files, and network resources
CVE-2026-40304 MEDIUM 5.3 UPGRADE zrok is software for sharing web services, files, and network resources
CVE-2026-42275 HIGH 8.7 UPGRADE zrok is software for sharing web services, files, and network resources
CVE-2026-45568 CRITICAL 9.1 UPGRADE zrok is software for sharing web services, files, and network resources
CVE-2026-45576 HIGH 7.5 UPGRADE zrok is software for sharing web services, files, and network resources

References

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