CVE-2026-16242 (GCVE-0-2026-16242)

Vulnerability from cvelistv5 – Published: 2026-07-20 07:33 – Updated: 2026-08-12 20:50
VLAI
Title
Hypershift: konnectivity proxy-server accepts agent connections without validating client certificates
Summary
A flaw was found in the Konnectivity proxy-server configuration for hosted control planes. The agent-facing listener was started without --cluster-ca-cert (and without token-based agent authentication), so client certificates were not validated. A remote attacker who can reach the Konnectivity cluster endpoint could connect as an unauthenticated agent, join the routing pool, and potentially proxy, inspect, modify, or drop control-plane-to-node traffic.
Severity
9.4 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 14:56 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:46885 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47388 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47728 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47735 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47949 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47953 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47974 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48284 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48657 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48670 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48676 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48693 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48699 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50758 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-16242 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2502690 issue-trackingx_refsource_REDHAT
https://github.com/openshift/hypershift/pull/9031
Impacted products
Vendor Product Version
Red Hat multicluster engine for Kubernetes 2.10 Unaffected: 1784905766 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.10::el9
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Red Hat multicluster engine for Kubernetes 2.11 Unaffected: 1784945966 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.11::el9
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Red Hat multicluster engine for Kubernetes 2.17 Unaffected: 1784856942 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.17::el9
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Red Hat multicluster engine for Kubernetes 2.6 Unaffected: 1784905804 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.6::el9
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Red Hat multicluster engine for Kubernetes 2.8 Unaffected: 1784905783 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.8::el9
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Red Hat multicluster engine for Kubernetes 2.9 Unaffected: 1784905769 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.9::el9
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Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 1785534428 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.17 Unaffected: 1784914869 , < * (rpm)
    cpe:/a:redhat:openshift:4.17::el9
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Red Hat Red Hat OpenShift Container Platform 4.18 Unaffected: 1784912882 , < * (rpm)
    cpe:/a:redhat:openshift:4.18::el9
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Red Hat Red Hat OpenShift Container Platform 4.19 Unaffected: 1784913720 , < * (rpm)
    cpe:/a:redhat:openshift:4.19::el9
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Red Hat Red Hat OpenShift Container Platform 4.20 Unaffected: 1785288843 , < * (rpm)
    cpe:/a:redhat:openshift:4.20::el9
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Red Hat Red Hat OpenShift Container Platform 4.21 Unaffected: 1785301941 , < * (rpm)
    cpe:/a:redhat:openshift:4.21::el9
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Red Hat Red Hat OpenShift Container Platform 4.22 Unaffected: 1785192936 , < * (rpm)
    cpe:/a:redhat:openshift:4.22::el9
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Red Hat Logging Subsystem for Red Hat OpenShift     cpe:/a:redhat:logging:6
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Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat OpenShift API for Data Protection     cpe:/a:redhat:openshift_api_data_protection:1
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2     cpe:/a:redhat:acm:2
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Date Public
2026-07-17 00:00
Credits
Red Hat would like to thank Microsoft Security Research (MSRC) (Microsoft) for reporting this issue.
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      "product_status:known_not_affected": "4088",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "hypershift: Konnectivity proxy-server accepts agent connections without validating client certificates",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16242.json",
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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.