CVE-2026-105223
CRITICAL 9.1maclof kubernetes-client 0.17.0 before 0.32.0 disables TLS certificate verification in parseKubeconfig() and parseKubeconfigFile() when a kubeconfig lacks certificate-authority-data, ignoring insecure-skip-tls-verify. On-path attackers can impersonate the Kubernetes API server to capture Bearer tokens or Basic credentials and tamper with WebSocket or REST API traffic.
Severe if exploited (CVSS 9.1), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 10th percentile
Impact if exploited
9.1CVSS 4.0 · CRITICAL
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityNone
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: Needs a race window or specific setup
- ⚠Requirements: Specific conditions must be present
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-295: Improper Certificate Validation
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References and research data (JSON)
All CVSS metrics
- CRITICAL 9.1 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N - HIGH 7.4 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - CRITICAL 9.1 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 7.4 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
References
Patches & mitigations
- https://github.com/maclof/kubernetes-client/commit/924c0b935fa538ed6b4b0948127609e99d0e6f34 CVE record · VulnCheck · Updated 2026-10-05T00:47:08.567Z
NVD · CVE-2026-105223 · Updated 2026-10-06T16:08:43.180 - https://github.com/maclof/kubernetes-client/releases/tag/0.32.0 CVE record · VulnCheck · Updated 2026-10-05T00:47:08.567Z
NVD · CVE-2026-105223 · Updated 2026-10-06T16:08:43.180
Advisories
- https://www.vulncheck.com/advisories/maclof-kubernetes-client-0.17.0-before-0.32.0-disabled-tls-certificate-verification CVE record · VulnCheck · Updated 2026-10-05T00:47:08.567Z
NVD · CVE-2026-105223 · Updated 2026-10-06T16:08:43.180 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-92155 EUVD · EUVD-2026-92155
Technical & other
- https://github.com/maclof/kubernetes-client/issues/135 CVE record · VulnCheck · Updated 2026-10-05T00:47:08.567Z
NVD · CVE-2026-105223 · Updated 2026-10-06T16:08:43.180 - https://github.com/maclof/kubernetes-client CVE record · VulnCheck · Updated 2026-10-05T00:47:08.567Z
NVD · CVE-2026-105223 · Updated 2026-10-06T16:08:43.180 - https://github.com/maclof/kubernetes-client/blob/0.31.0/src/Client.php#L309-L312 CVE record · VulnCheck · Updated 2026-10-05T00:47:08.567Z
NVD · CVE-2026-105223 · Updated 2026-10-06T16:08:43.180