It was found that in icedtea-web up to and including 1.7.2 and 1.8.2 executable code could be injected in a JAR file without compromising the signature verification. An attacker could use this flaw to inject code in a trusted JAR. The code would be executed inside the sandbox.
https://security.gentoo.org/glsa/202107-51
https://seclists.org/bugtraq/2019/Oct/5
https://lists.debian.org/debian-lts-announce/2019/09/msg00008.html
https://github.com/AdoptOpenJDK/IcedTea-Web/pull/344
https://github.com/AdoptOpenJDK/IcedTea-Web/issues/327
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10181
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00045.html