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Full vulnerability report · 2026
CVE-2026-66786High confidence

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

Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17

Official source article: Red Hat RHSA-2026:63016 ↗. Check the applicable product and release in the original source.

9.1CriticalCVSS 3.1
Recommended action
Within 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 1.36% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-66786 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysubmariner: submariner: ipsec.conf stanza injection via remote-supplied CableName and Subnets
2 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • rhacm2/submariner-addon-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2
  • rhacm2/submariner-operator-bundle as a component of Red Hat Advanced Cluster Management for Kubernetes 2
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.
Remediation
For release note details, see the upstream Submariner release notes: https://submariner.io/community/releases/ Downstream-specific issues resolved: * ACM-30182 * ACM-32385 * ACM-34578 * ACM-34651 * ACM-34693 * ACM-36281 * ACM-36898 * ACM-36899 * ACM-36907 * ACM-36909 * ACM-36910 * ACM-36911 * ACM-36912 * ACM-36927 * ACM-38289 * ACM-38295 * ACM-38315 * ACM-38320 * ACM-38322 * ACM-38330 * ACM-38357 * ACM-38360 * ACM-38447 * ACM-38448 * ACM-38449 * ACM-38450 * ACM-38451 * ACM-38452 * ACM-38453 * ACM-38466 * ACM-38494 * ACM-38495 * ACM-38496 * ACM-38497 * ACM-38499 * ACM-38500 * ACM-38513 * ACM-38515 * ACM-38519 * ACM-38520 * ACM-38533 * ACM-38538 * ACM-38542 * ACM-38546 * ACM-39374 * ACM-39382 * ACM-39384 * ACM-39385 * ACM-39510 * ACM-39511 * ACM-39568 * ACM-40464 * ACM-41039 * ACM-42640 For more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.17/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-70247

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

Untrusted data can cross into a code-evaluation path and be interpreted as executable instructions.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may execute code or commands in the affected security context.

What

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.

Why

Untrusted data can cross into a code-evaluation path and be interpreted as executable instructions.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Control of Generation of Code ('Code Injection') → execute code or commands in the affected security context
Attack surface
Network
Privileges required
High: elevated access is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-94 ↗

CWE-94: Improper Control of Generation of Code ('Code Injection'). The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkRemote code executionCWE-94
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-70247Official EUVD mapping

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.

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260909Security Bulletin 9 Sep 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 9 Sep 2026, published on 9 September 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For release note details, see the upstream Submariner release notes: https://submariner.io/community/releases/ Downstream-specific issues resolved: * ACM-30182 * ACM-32385 * ACM-34578 * ACM-34651 * ACM-34693 * ACM-36281 * ACM-36898 * ACM-36899 * ACM-36907 * ACM-36909 * ACM-36910 * ACM-36911 * ACM-36912 * ACM-36927 * ACM-38289 * ACM-38295 * ACM-38315 * ACM-38320 * ACM-38322 * ACM-38330 * ACM-38357 * ACM-38360 * ACM-38447 * ACM-38448 * ACM-38449 * ACM-38450 * ACM-38451 * ACM-38452 * ACM-38453 * ACM-38466 * ACM-38494 * ACM-38495 * ACM-38496 * ACM-38497 * ACM-38499 * ACM-38500 * ACM-38513 * ACM-38515 * ACM-38519 * ACM-38520 * ACM-38533 * ACM-38538 * ACM-38542 * ACM-38546 * ACM-39374 * ACM-39382 * ACM-39384 * ACM-39385 * ACM-39510 * ACM-39511 * ACM-39568 * ACM-40464 * ACM-41039 * ACM-42640 For more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.17/
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 2 Sept 2026 · Last source change 5 Sept 2026, 01:01 UTC · CWE-94 · Improper Control of Generation of Code ('Code Injection')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-03
European sourceENISA EUVD · EUVD-2026-70247
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: removed vendor advisory: access.redhat.com/RHSA-2026:63016.
    Before
    remediation: access.redhat.com/RHSA-2026:63016 · vendor advisory: access.redhat.com/RHSA-2026:63016
    After
    remediation: access.redhat.com/RHSA-2026:63016
    CNA ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:63016; added vendor advisory: access.redhat.com/RHSA-2026:63016.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:63016 · vendor advisory: access.redhat.com/RHSA-2026:63016
    access.redhat.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    See the vendor and CVE records for the affected range. · Fixed: 1788023916 < *; 1788023940 < *; 1788105072 < *; 1788043964 < *; 1788043961 < *; 1788073481 < *; 1788043970 < *
    CNA ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    access.redhat.com ↗
  5. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-66786 to remediation: access.redhat.com/CVE-2026-66786.
    Before
    remediation: access.redhat.com/CVE-2026-66786
    After
    remediation: access.redhat.com/CVE-2026-66786
    Red Hat Product Security ↗
  6. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    rhacm2/lighthouse-agent-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/lighthouse-coredns-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/subctl-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-addon-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-gateway-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-globalnet-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-operator-bundle as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-rhel9-operator as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-route-agent-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2
    After
    rhacm2/submariner-addon-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-operator-bundle as a component of Red Hat Advanced Cluster Management for Kubernetes 2 · Fixed: registry.redhat.io/rhacm2/lighthouse-agent-rhel9@sha256:329806e6d9cee8c20823f45a67c1b0cdb4a8af957c520ef8303557576e8a32f0_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-agent-rhel9@sha256:5ae6ea9d9cdeab414a4010e580455a2eb7d1dc23e62d27d1629f531d10930e8d_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-agent-rhel9@sha256:6ad357fc6bd252aad971852abf04c809245e8774b0af10b32f9f01393d7abebf_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-agent-rhel9@sha256:ecce053c0601c91638c2f9aea23289e685194839886b5d1701ccbf602d20ce75_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-coredns-rhel9@sha256:321dc468744626a9542c344381f9db454d7cbc7a69e3a925365ce1d8ae8ca474_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-coredns-rhel9@sha256:4b0e567a6b91e16899ad070e6ebe366885e5c2f333ed5f55cfa7e2bd8fc98565_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-coredns-rhel9@sha256:7977035d3755e95121062d90a386a6b23af5d394dacb7c5e622098d70285e1d3_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/lighthouse-coredns-rhel9@sha256:d58913107527d89b998ea945f7aa164ee8ca67de994965e7aa08dc659f4dd818_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:1b38ba10de27535bc6e76dac4db2e66b95e7c666f20136c15d7ac11531c541df_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:a8f500a30142993b8d07f4ed5b29007d89c6edc09ece1bbd72b4467e1a504c6b_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:d5ff003a3893554a20712a9aebda49be7a6e83594ecc5fd8bb898567734c86b8_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:fb5fdb72a0f7d4b8555359d506eebd63d10713a2fd24b5a3669554155f620c62_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-gateway-rhel9@sha256:7045277055dbf89b028bab81aaddf2b9793e3f55aa6f611d92c6619c97d0b91f_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-gateway-rhel9@sha256:73e5857eceadffb8ac80ef9e67720dd13f56ddbc08d6438b936eb3b1f3cfc08b_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-gateway-rhel9@sha256:7960fe35f5506118d31813c2d263aa8212f32b719b6053fa52c5fe6447b6464c_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-gateway-rhel9@sha256:bdd03a5cb677b0fa583f223dd9602b53a3d186720ad641e46bde67b2abd69cdc_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-globalnet-rhel9@sha256:38f793d2ffc56c1728eecff1b427435c4580c1edfee32fe747a35cd5951e385c_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-globalnet-rhel9@sha256:933c7641c879446b0c0f145d1a1ac6bda43d397cd3aac9e72195228d6ba6198e_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-globalnet-rhel9@sha256:9cd8f3b7ae72986e653970d8f8a40626fa847e719e36e99fb5c25e1571255b68_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-globalnet-rhel9@sha256:f2478a2954975e8972458ccd2ae48d81fd1ab4cf393ab427eca0c91c3d0833f1_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:0714135f3594b0e42c4d185779b3a716fc98c6bc35135aa6dec2c9730c93ae52_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:1c0fe9629265844d3cd36fa6fd358026087240dee118e1d438f3ac273f427054_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:5d1225146756be65df394eeb2ec2afa87b025b6e5bfbc9ddd89eaff47d5a40d8_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:93850d48fc8efac7bc3630e4102f5471bcf84921a31c17bc1512e77a4602fc36_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-route-agent-rhel9@sha256:2fb77f64012b0025fe9bb9b31525267556ffb28011749934d23c70070cadf6ea_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-route-agent-rhel9@sha256:96132035085915456375c22dc16257074197c7f3ad198f1476f1445c9969f3a5_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-route-agent-rhel9@sha256:cd0b7176e4df72c90e044abd5e63598c590a5001d5bfc988cb0cf42b22e08c1d_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-route-agent-rhel9@sha256:ce038f66b66600aba82aaa978e8c50cd5b319e6599e50426d4476da9124cd92f_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17
    Red Hat Product Security ↗
  8. ENISA EUVD mappingEUVD-2026-70247 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-70247"}
    ENISA EUVD ↗
  9. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-70247↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:63016↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-66786 · cve.blacktree.nl