Skip to content
Fencer Vulns
critical 9.1

CVE-2026-66786 json

Submariner: submariner: ipsec.conf stanza injection via remote-supplied cablename and subnets

published 2026-09-02 2 mo ago modified 2026-10-19 20 d ago also EUVD-2026-70247

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

A flaw was found in submariner. In cert-auth mode, the connection configuration is built using free-form strings from the Custom Resource Definition (CRD) without proper validation. A malicious cluster can exploit this by publishing a CableName that includes newlines and ipsec.conf directives. This allows an attacker to inject arbitrary configuration parameters or execute commands through leftupdown hooks, leading to remote code execution as root on the gateway node.

Patch / fix

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1790670231, 1790670233, 1790670243, 1790670254, 1790670439, 1790670508, 1790670912
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1788023916, 1788023940, 1788043961, 1788043964, 1788043970, 1788073481, 1788105072

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66786 updated cvss 9.1

submariner: submariner: ipsec.conf stanza injection via remote-supplied CableName and Subnets

  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/submariner-addon-rhel9, rhacm2/submariner-operator-bundle
    affected: workaround, no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/subctl-rhel9 1790670243, rhacm2/lighthouse-agent-rhel9 1790670439, rhacm2/lighthouse-coredns-rhel9 1790670231, rhacm2/submariner-gateway-rhel9 1790670508, rhacm2/submariner-rhel9-operator 1790670912, rhacm2/submariner-globalnet-rhel9 1790670233, +1 more
    fixed: vendor fix RHSA-2026:85227
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/subctl-rhel9 1788105072, rhacm2/lighthouse-agent-rhel9 1788023916, rhacm2/lighthouse-coredns-rhel9 1788023940, rhacm2/submariner-gateway-rhel9 1788043964, rhacm2/submariner-rhel9-operator 1788073481, rhacm2/submariner-globalnet-rhel9 1788043961, +1 more
    fixed: vendor fix RHSA-2026:63016
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/nettest-rhel9 1790702141, rhacm2/submariner-operator-bundle 1790750775 Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/nettest-rhel9 1788166791, rhacm2/submariner-operator-bundle 1788217593
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

1.37% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.