CVE-2026-4789: Kyverno, versions 1.16.0 and later, are vulnerable to SSRF due to unrestricted CEL HTTP functions.

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-4789 is a critical-severity flaw (CVSS 9.8) affecting kyverno. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kyverno, versions 1.16.0 and later, are vulnerable to SSRF due to unrestricted CEL HTTP functions.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: kyverno

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

Am I affected?

Timeline

2026-03-30 21:17 UTCPublished CVE record published
2026-06-17 10:57 UTCUpdated Record last modified

kyverno kyverno UPGRADE

Affected: >= 1.16.0 and <= 1.17.1

Fixed in: newer than 1.17.1

Safe to downgrade to: a release before 1.16.0

1. Check installed version

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

2. UPGRADE to newer than 1.17.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kyverno

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 1.16.0 (Debian / Ubuntu)

apt-cache madison kyverno sudo apt install kyverno=<VERSION_BEFORE_1.16.0> sudo apt-mark hold kyverno

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

dnf --showduplicates list kyverno sudo dnf downgrade kyverno-<VERSION_BEFORE_1.16.0> sudo dnf versionlock add kyverno

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-2026-4789?

kyverno: upgrade to newer than 1.17.1. Exact commands for each OS are on this page.

Is CVE-2026-4789 being exploited?

CVE-2026-4789 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-2026-4789 affect?

CVE-2026-4789 affects kyverno. Severity is critical (CVSS 9.8). Kyverno, versions 1.16.0 and later, are vulnerable to SSRF due to unrestricted CEL HTTP functions.

How urgent is CVE-2026-4789?

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

Related CVEs

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CVE-2026-41068 HIGH 7.7 UPGRADE Kyverno is a policy engine designed for cloud native platform engineering teams
CVE-2026-40868 HIGH 8.1 UPGRADE Kyverno is a policy engine designed for cloud native platform engineering teams

References

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