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CVE-2026-16242

CRITICAL 9.4

Published 2026-07-20 · Last modified 2026-08-18

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.

ELEVATED IMPACT

Severe if exploited (CVSS 9.4), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.8%chance of exploitation in 30 days · 54th percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

9.4CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityLow

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-16242/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-16242/poc.json

Affected

Vendors Red Hat

Products Multicluster Engine For Kubernetes 2.1 Multicluster Engine For Kubernetes 2.11 Multicluster Engine For Kubernetes 2.17 Multicluster Engine For Kubernetes 2.6 Multicluster Engine For Kubernetes 2.8 Multicluster Engine For Kubernetes 2.9.0 Red Hat Openshift Container Platform 4.16 Red Hat Openshift Container Platform 4.17 Red Hat Openshift Container Platform 4.18 Red Hat Openshift Container Platform 4.19 Red Hat Openshift Container Platform 4.2 Red Hat Openshift Container Platform 4.21

Weakness (CWE)

  • CWE-306: Missing Authentication for Critical Function

CVSS vector

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

All CVSS metrics

  • CRITICAL 9.4 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
  • CRITICAL 9.4 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS