CVE-2026-26056: Arbitrary WASM Code Execution via AnnotationOverrideFlight Injection in Yoke ATC

Severity: high (CVSS 8.8 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-94

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. 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.

Affected products

yokecd yoke: through 0.19.0

References

https://github.com/yokecd/yoke/security/advisories/GHSA-wj8p-jj64-h7ff

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