Read the docs
TI-2026-21059 Aliases CVE-2026-26055GHSA-965m-v4cc-6334

Unauthenticated Admission Webhook Endpoints in Yoke ATC

Priority HIGH 72CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00466 40th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
yokecdyokeup to 0.19.0—No fix listedCNA
—github.com/yokecd/yoke (Go)up to 0.19.0—No fix listedGHSA-965m-v4cc-6334
  • yoke Vendoryokecd Affected up to 0.19.0 Fixed in — No fix listed CNA
  • github.com/yokecd/yoke (Go) Vendor— Affected up to 0.19.0 Fixed in — No fix listed GHSA-965m-v4cc-6334

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:yokecd:yoke:*:*:*:*:*:*:*:*up to 0.19.0Vulnerableyokecd
  • cpe:2.3:a:yokecd:yoke:*:*:*:*:*:*:*:* Versions up to 0.19.0 Vulnerable ·yokecd

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26055
  2. 2026-10-03 Alias added: GHSA-965m-v4cc-6334
  3. 2026-10-11 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-21060 Arbitrary WASM Code Execution via AnnotationOverrideFlight Injection in Yoke ATC CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences