Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-18874
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 — Volsync-addon-controller: volsync-addon-controller: annotation values rendered into yaml via text/template without escaping allows yaml injection into subscription
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H H N U L H H 6.2 .0054 43.3 —
AFFECTED
Product Versions Fixed
Red Hat Advanced Cluster Management for Kubernetes 2.11 unspecified 1787683560
Red Hat Advanced Cluster Management for Kubernetes 2.13 unspecified 1787266564
Red Hat Advanced Cluster Management for Kubernetes 2.14 unspecified 1787266564
Red Hat Advanced Cluster Management for Kubernetes 2.15 unspecified 1787266360
Red Hat Advanced Cluster Management for Kubernetes 2.16 unspecified 1787266564
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1787266556
TIMELINE
Aug 4 Reserved by redhat
Aug 19 Published (CNA: redhat)
Aug 26 PATCH SHIPPED — CVE-2026-18874 (Red Hat Advanced Cluster Management for Kubernetes 2.11). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.11 1787683560.
Description
A flaw was found in volsync-addon-controller. This vulnerability allows an attacker to inject malicious YAML (Yet Another Markup Language) code into the OpenShift Lifecycle Manager (OLM) Subscription resource. This is due to improper escaping of annotation values when they are rendered into YAML. Successful exploitation could lead to unauthorized modification or control over OLM Subscription configurations, potentially impacting software management within the cluster. This issue primarily affects systems where the 'volsync-addon-deploy-type: olm' annotation is explicitly enabled.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 4, 2026 | Reserved | Reserved by redhat |
| August 19, 2026 | Published | Published (CNA: redhat) |
| August 26, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-18874 (Red Hat Advanced Cluster Management for Kubernetes 2.11). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.11 1787683560. |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.11 | — | — | 1787683560 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.13 | — | — | 1787266564 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.14 | — | — | 1787266564 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.15 | — | — | 1787266360 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.16 | — | — | 1787266564 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1787266556 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-18874 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
