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

CVE-2026-26055 PUBLISHED CVSS 7.5 HIGH

Unauthenticated Admission Webhook Endpoints in Yoke ATC

Reported by github_m · Published February 12, 2026

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.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

Package	Ecosystem	Fixed in
yoke	yokecd	0.19.0

Risk scores

CVSS 3.1

7.5

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

Affected products

Vendor	Product	Versions
yokecd	yoke	<= 0.19.0
yokecd	yoke	0
github.com	yokecd/yoke	0

Timeline

Feb 12, 2026 CVE Published
Feb 12, 2026 CVE Updated
Feb 13, 2026 EPSS Score (30 in total, the first dated here)
Feb 13, 2026 PoC Published (2 in total, the first dated here)
Mar 17, 2026 Security Advisory
Mar 22, 2026 Coalition ESS Score (2 in total, the first dated here)

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2026-26055
vulnetix vdb fixes CVE-2026-26055

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curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-26055/fixes/registry"

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References

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