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Back to active CVEs
High · CVSS 8.7CVE-2026-66785

Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijackCVE-2026-66785

Answer in brief

CVE-2026-66785 records a High severity (CVSS 8.7) vulnerability in Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijack. 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.

Published Aug 20, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Aug 20, 2026Material review Oct 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.7. 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.

Affected scope and exposure questions

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.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/rhacm2/submariner-addon-rhel9generic*Not reported
Red Hat/rhacm2/submariner-operator-bundlegeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/rhacm2/submariner-addon-rhel9, Red Hat/rhacm2/submariner-operator-bundle.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Evidence timeline and material changes

  1. Published upstream

    Aug 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 20, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious cluster, enabling it to declare arbitrary network ranges. Consequently, all network traffic intended for these arbitrary ranges from peer clusters will be rerouted through the attacker's tunnel, potentially leading to unauthorized information disclosure or network disruption.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-20, CWE-732, CWE-345
Source
CVE List V5
Source checked
Oct 13, 2026
References
3 linked sources
Open source record