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01 Record

CVE-2026-66785

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

HighPUBLISHEDCNA: redhat
CNA base score8.7 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
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02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.20% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 10.5% of scored records. A rank, not a probability.
NVD base score
8.7 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-19.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-08-20 18:15Z2 MO AGO
Last updated
2026-10-19 17:30Z10 DAYS AGO
Reserved
2026-07-27
Assigning CNA
redhat
Record state
PUBLISHED
Severity
High (CVSS 8.7)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Weaknesses
  • CWE-345Insufficient Verification of Data AuthenticityClass
Data version
5.2
Document digest
38d08dc1a14b1bb2af743f0b1268589644cf8e894a3611a3478b611f1fcfd912

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16Not specified—
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17Not specified—
Red HatRed Hat Advanced Cluster Management for Kubernetes 2Not specified—

06 References