CVE record · CVE-2026-66785

Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijack

CVSS 8.7 HighEPSS 0.0021 · 10th percentile

Published by the CVE Program (CNA: redhat) at 20 Aug 2026, 18:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/lighthouse-agent-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1790670439 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/lighthouse-coredns-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1790670231 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/subctl-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1790670243 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/submariner-gateway-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1790670508 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/submariner-globalnet-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1790670233 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/submariner-rhel9-operator https://catalog.redhat.com/software/containers/	unaffected 1790670912 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.16 Package name: rhacm2/submariner-route-agent-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1790670254 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/lighthouse-agent-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788023916 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/lighthouse-coredns-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788023940 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/subctl-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788105072 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/submariner-gateway-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788043964 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/submariner-globalnet-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788043961 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/submariner-rhel9-operator https://catalog.redhat.com/software/containers/	unaffected 1788073481 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2.17 Package name: rhacm2/submariner-route-agent-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788043970 to before * rpm Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2 Package name: rhacm2/submariner-addon-rhel9 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected
Red Hat	Red Hat Advanced Cluster Management for Kubernetes 2 Package name: rhacm2/submariner-operator-bundle https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected

Identifiers: CVE-2026-66785
CNA: redhat
Weakness (CWE): CWE-345
Tags: Red Hat Advanced Cluster Management for Kubernetes 2.16
Red Hat Advanced Cluster Management for Kubernetes 2.17
Red Hat Advanced Cluster Management for Kubernetes 2
CWE-345
Published: 20 Aug 2026
Updated: 19 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.7	High	3.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N	CNA (redhat)

CISA KEV Not listed.
EPSS 0.0021, the 10th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 20 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

access.redhat.com/errata/RHSA-2026:63016 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:85227 vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2026-66785 vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi?id=2507530 issue-trackingredhat

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.