CVE-2026-122305Kyverno before 1.19.2 Denial of Service via Nested Variable Substitution Loop

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.

8.3 HIGHEPSS 0.30%Not in KEVNVD: Undergoing Analysis

Last updated: 2026-11-05 14:58 UTC

OverviewCVSS details

8.3HIGHCVSS 4.0

Score source: VulnCheck (CNA)
NVD status: Undergoing Analysis
Published: Nov 5, 2026
Assigner: VulnCheck

Affected

kyverno (kyverno)

Versions: before 1.19.2
Fixed in: 1.19.2

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —

EPSS · FIRST, scored Nov 7

0.30%chance of exploitation in 30 days

Higher than 22.94% of CVEs

CVSS 4.0 · VulnCheck (CNA)

8.3High

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: Low
User interaction: None
Confidentiality impact: None
Integrity impact: None
Availability impact: High
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): High

CVSS 3.1 · VulnCheck (CNA)

7.7High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Changed
Confidentiality impact: None
Integrity impact: None
Availability impact: High

NVD status: Undergoing Analysis

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.3	HIGH	4.0VulnCheck (CNA)	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
7.7	HIGH	3.1VulnCheck (CNA)	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Details

CVE ID: CVE-2026-122305
Status: Undergoing Analysis
Assigner (CNA): VulnCheck
Published: Nov 5, 2026
Last modified: 2026-11-05 14:58 UTC
Weaknesses: CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:30 UTC.