It was found that the fix for CVE-2016-9606 in versions 3.0.22 and 3.1.2 was incomplete and Yaml unmarshalling in Resteasy is still possible via Yaml.load() in YamlProvider.
Yaml.load()
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1051.json"