CVE-2026-66785

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.

CVSS v3 8.7 HIGH

8.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.3 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:63016
https://access.redhat.com/errata/RHSA-2026:85227
https://access.redhat.com/security/cve/CVE-2026-66785
https://bugzilla.redhat.com/show_bug.cgi?id=2507530

Configurations

No configuration.

History

19 Oct 2026, 18:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:85227 -

18 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Se encontró un fallo en Submariner. Esta vulnerabilidad permite a un clúster malicioso (spoke) redirigir el tráfico de red de otros clústeres conectados (clústeres pares) al publicar un punto final de red especialmente diseñado. El sistema no valida correctamente las subredes de red proporcionadas por el clúster malicioso, lo que le permite declarar rangos de red arbitrarios. En consecuencia, todo el tráfico de red destinado a estos rangos arbitrarios desde los clústeres pares será redirigido a través del túnel del atacante, lo que podría llevar a una revelación de información no autorizada o a una interrupción de la red.

13 Oct 2026, 18:17

Type	Values Removed	Values Added
CWE	~~CWE-732~~	CWE-345
CVSS	v2 : ~~unknown~~ v3 : ~~2.5~~	v2 : unknown v3 : 8.7

Information

Published : 2026-08-20 19:16

Updated : 2026-10-19 18:17

NVD link : CVE-2026-66785

Mitre link : CVE-2026-66785

CVE.ORG link : CVE-2026-66785

JSON object : View

Products Affected

No product.

CWE

CWE-345

Insufficient Verification of Data Authenticity

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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."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en Submariner. Esta vulnerabilidad permite a un cl\u00faster malicioso (spoke) redirigir el tr\u00e1fico de red de otros cl\u00fasteres conectados (cl\u00fasteres pares) al publicar un punto final de red especialmente dise\u00f1ado. El sistema no valida correctamente las subredes de red proporcionadas por el cl\u00faster malicioso, lo que le permite declarar rangos de red arbitrarios. En consecuencia, todo el tr\u00e1fico de red destinado a estos rangos arbitrarios desde los cl\u00fasteres pares ser\u00e1 redirigido a trav\u00e9s del t\u00fanel del atacante, lo que podr\u00eda llevar a una revelaci\u00f3n de informaci\u00f3n no autorizada o a una interrupci\u00f3n de la red."}], "lastModified": "2026-10-19T18:17:08.157", "sourceIdentifier": "secalert@redhat.com"}