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TI-2026-29924 Aliases CVE-2026-41323GHSA-f9g8-6ppc-pqq4

Kyverno: ServiceAccount token leaked to external servers via apiCall service URL

Priority HIGH 74CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4, Kyverno's apiCall feature in ClusterPolicy automatically attaches the admission controller's ServiceAccount token to outgoing HTTP requests. The service URL has no validation — it can point anywhere, including attacker-controlled servers. Since the admission controller SA has permissions to patch webhook configurations, a stolen token leads to full cluster compromise. Versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 patch the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0056 46th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed kyverno (kyverno): 1.16.4, 1.17.2-rc1github.com/kyverno/kyverno (Go): 1.17.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
kyvernokyvernobefore 1.16.4; 1.17.0-rc1 to before 1.17.2-rc11.16.4, 1.17.2-rc1Patch availableCNA
—github.com/kyverno/kyverno (Go)before 1.17.01.17.0Patch availableGHSA-f9g8-6ppc-pqq4
  • kyverno Vendorkyverno Affected before 1.16.4; 1.17.0-rc1 to before 1.17.2-rc1 Fixed in 1.16.4, 1.17.2-rc1 Patch available CNA
  • github.com/kyverno/kyverno (Go) Vendor— Affected before 1.17.0 Fixed in 1.17.0 Patch available GHSA-f9g8-6ppc-pqq4

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:kyverno:kyverno:*:-:*:*:*:*:*:*before 1.16.4Vulnerablekyverno
cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:*1.17.0 to before 1.17.2Vulnerablekyverno
  • cpe:2.3:a:kyverno:kyverno:*:-:*:*:*:*:*:* Versions before 1.16.4 Vulnerable ·kyverno
  • cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:* Versions 1.17.0 to before 1.17.2 Vulnerable ·kyverno

Remediation

  • Fix · CNA kyverno (kyverno) Fixed in 1.16.4, 1.17.2-rc1
  • Fix · GHSA-f9g8-6ppc-pqq4 github.com/kyverno/kyverno (Go) Fixed in 1.17.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41323
  2. 2026-10-03 Alias added: GHSA-f9g8-6ppc-pqq4

References

Exploit 1

Patch 3

Advisory 1

Other 1

  • TI-2026-17733 Kyverno Cross-Namespace Privilege Escalation via Policy apiCall CVSS 3.1CRITICAL 10.0
  • TI-2026-29524 kyverno apicall servicecall implicit bearer token injection leaks kyverno serviceaccount token CVSS 3.1HIGH 8.1
  • TI-2025-21189 Kyverno ignores subjectRegExp and IssuerRegExp CVSS 3.1HIGH 8.0
  • TI-2026-30072 Kyverno Controller Denial of Service via forEach Mutation Panic CVSS 3.1HIGH 7.7
  • TI-2026-29707 Kyverno: Cross-Namespace Read Bypasses RBAC Isolation (CVE-2026-22039 Incomplete Fix) CVSS 3.1HIGH 7.7
  • TI-2026-19239 Kyverno Denial of Service via Context Variable Amplification in Policy Engine CVSS 3.1HIGH 7.7
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences