Vulnerability · Published Nov 5, 2026 · Assigned by VulnCheck

CVE-2026-122306Kyverno before 1.19.2 Denial of Service via Exponential-Time Wildcard Matching

High 7.7

In plain English

A high-severity security flaw in kyverno from kyverno. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.3%top 77.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Kyverno before 1.19.2 contains a denial of service vulnerability that allows namespaced policy authors to exhaust admission controller CPU by submitting pathological wildcard patterns. Attackers can create a Policy with crafted match and exclude names evaluated by ValidateMatchExcludeConflict, pinning cores and causing cluster-wide webhook timeouts that block resource operations.

Affected products (as reported)

Vendor	Product	Versions
kyverno	kyverno	0 – before 1.19.2

Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-8mrj-27wr-599g) vendor-advisory
VulnCheck Advisory: Kyverno before 1.19.2 Denial of Service via Exponential-Time Wildcard Matching third-party-advisory