CVE-2026-26056 Arbitrary WASM Code Execution via AnnotationOverrideFlight Injection in Yoke ATC
Attackers with CR permissions can execute arbitrary WASM code in the Yoke ATC controller, potentially escalating privileges to cluster-admin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26056?
CVE-2026-26056 is a high-severity code injection vulnerability in yokecd yoke, published on 12 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-26056?
3 open source packages ship an affected version, including github.com/yokecd/yoke. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/yokecd/yoke Go | All versions | None |
github.com/yokecd/yoke Go | All versions to 0.19.0 | None |
github.com/yokecd/yoke Go | All versions to 0.19.0 | None |
Products include Yokecd Yoke.
How do I fix CVE-2026-26056?
Upgrade to a fixed version.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-26056 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26056 exists.
Other vulnerabilities in yokecd yoke
Sources
Also known as GHSA-wj8p-jj64-h7ff, GO-2026-4493.