What is CVE-2026-4789?

CVE-2026-4789 is a critical-severity vulnerability in Kyverno, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2026-03-30.

How severe is CVE-2026-4789?

Critical severity. CVSS v3 base score is 9.8 out of 10.

SSRF in Kyverno

CVE-2026-4789

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

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (49.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000

Affected products

Kyverno — versions 1.16.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/kyverno/kyverno (Product)
kb.cert.org/vuls/id/655822 (Third Party Advisory)
portswigger.net/web-security/ssrf (Technical Description)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-4789?: CVE-2026-4789 is a critical-severity vulnerability in Kyverno, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2026-03-30.
How severe is CVE-2026-4789?: Critical severity. CVSS v3 base score is 9.8 out of 10.