Answer in brief
CVE-2026-66783 records a Medium severity (CVSS 8.2) vulnerability in Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref. The current sources do not mark it as known exploited. The current feed maps Red Hat/rhacm2/submariner-addon-rhel9 (generic), Red Hat/rhacm2/submariner-operator-bundle (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Red Hat/rhacm2/submariner-addon-rhel9 (generic), Red Hat/rhacm2/submariner-operator-bundle (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Red Hat/rhacm2/submariner-addon-rhel9generic | * | Not reported |
| Red Hat/rhacm2/submariner-operator-bundlegeneric | * | Not reported |
Published upstream
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 18, 2026
A flaw was found in the `submariner-operator` component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability allows a cluster administrator, or any user with permissions to modify the Submariner Custom Resource (CR), to specify an unvalidated image path. This lack of validation enables an attacker to execute arbitrary code with elevated privileges across the entire cluster, including control-plane nodes, by deploying a malicious image.
Quoted source text, attributed separately from HOL analysis.