Debian: DLA-2390-1 Critical: Ruby-Json-Jwt String Element Handling

Therefore, there was a need to explicitly specify the number
of elements when splitting a JWE string.

For Debian 9 stretch, this problem has been fixed in version
1.6.2-1+deb9u2.

We recommend that you upgrade your ruby-json-jwt packages.

For the detailed security status of ruby-json-jwt please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/ruby-json-jwt

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS