CVE-2026-26055: Unauthenticated Admission Webhook Endpoints in Yoke ATC

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-12 · updated 2026-06-17
Weakness: CWE-306

Description

Yoke is a Helm-inspired infrastructure-as-code (IaC) package deployer. In 0.19.0 and earlier, a vulnerability exists in the Air Traffic Controller (ATC) component of Yoke. The ATC webhook endpoints lack proper authentication mechanisms, allowing any pod within the cluster network to directly send AdmissionReview requests to the webhook, bypassing Kubernetes API Server authentication. This enables attackers to trigger WASM module execution in the ATC controller context without proper authorization.

Affected products

yokecd yoke: through 0.19.0

References

https://github.com/yokecd/yoke/security/advisories/GHSA-965m-v4cc-6334

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