Arbitrary WASM Code Execution via AnnotationOverrideFlight Injection in Yoke ATC

published 2026-02-12 8 mo ago modified 2026-06-17 4 mo ago also GHSA-wj8p-jj64-h7ff , GO-2026-4493 , EUVD-2026-6191

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

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.

Patch / fix

distros 2

suse opensuse

govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1

suse advisories SUSE-SU-2026:0757-1

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 8 mo ago (2026-02-12)

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/yokecd/yoke/security/advisories/GHSA-wj8p-jj64-h7ff referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
go	github.com/yokecd/yoke	<=0.19.0 all versions	no fix listed

Affected products

yokecd yoke

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

github.com /yokecd/yoke/security/advisories/GHSA-wj8p-jj64-h7ff
web, exploit, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-26056
advisory
github.com /yokecd/yoke
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary