CVE-2026-66785
Submariner: submariner: unvalidated endpoint.spec.subnets propagated into wireguard allowedips / ipsec enables traffic hijack
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.
INFO
Published Date :
Aug. 20, 2026, 6:15 p.m.
Last Modified :
Aug. 20, 2026, 6:15 p.m.
Remotely Exploit :
Yes !
Source :
redhat
Affected Products
The following products are affected by CVE-2026-66785
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 53f830b8-0a3f-465b-8143-3b8a9948e749 |
Solution
- Update Submariner to the latest secure version.
- Ensure network subnet validation is enabled.
- Review connected cluster configurations.
- Monitor network traffic for anomalies.
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CVE-2026-66785 vulnerability anywhere in the article.