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 3.1

8.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 10% of CVEs (scores of 2026-10-25)

CWE

CWE-345

Published

2026-08-20

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

References

• 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

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