What is CVE-2026-122305?

CVE-2026-122305 is a high-severity vulnerability in Kyverno, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.7/10. Published 2026-11-05.

How severe is CVE-2026-122305?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Kyverno

CVE-2026-122305

Kyverno before 1.19.2 contains a denial of service vulnerability in substituteVariablesIfAny that allows low-privileged users to hang the admission webhook via self-referential variable templates. Attackers can create resources whose annotations re-introduce the embedded policy variable, causing unbounded substitution loops that exhaust CPU and memory and block cluster-wide admission.

Published 2026-11-05 · last modified 2026-11-05.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.0th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Kyverno

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/kyverno/kyverno/security/advisories/GHSA-338x-hgrv-626h (vendor-advisory)
www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-nested… (third-party-advisory)

Frequently asked questions

What is CVE-2026-122305?: CVE-2026-122305 is a high-severity vulnerability in Kyverno, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.7/10. Published 2026-11-05.
How severe is CVE-2026-122305?: High severity. CVSS v3 base score is 7.7 out of 10.