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TI-2026-21060 Aliases CVE-2026-26056GHSA-wj8p-jj64-h7ff

Arbitrary WASM Code Execution via AnnotationOverrideFlight Injection in Yoke ATC

Priority HIGH 73CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.

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. It allows users with CR create/update permissions to execute arbitrary WASM code in the ATC controller context by injecting a malicious URL through the overrides.yoke.cd/flight annotation. The ATC controller downloads and executes the WASM module without proper URL validation, enabling attackers to create arbitrary Kubernetes resources or potentially escalate privileges to cluster-admin level.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00455 39th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed yoke (yokecd): 0.19.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
yokecdyokebefore 0.19.00.19.0Patch availableCNA
—github.com/yokecd/yoke (Go)up to 0.19.0—No fix listedGHSA-wj8p-jj64-h7ff
  • yoke Vendoryokecd Affected before 0.19.0 Fixed in 0.19.0 Patch available CNA
  • github.com/yokecd/yoke (Go) Vendor— Affected up to 0.19.0 Fixed in — No fix listed GHSA-wj8p-jj64-h7ff

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

  • Fix · CNA yoke (yokecd) Fixed in 0.19.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26056
  2. 2026-10-03 Alias added: GHSA-wj8p-jj64-h7ff
  3. 2026-10-16 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 1

  • TI-2026-21059 Unauthenticated Admission Webhook Endpoints in Yoke ATC CVSS 3.1HIGH 7.5

Sources

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