New ruby packages are available for Slackware 14.2 and -current to fix security issues.

Here are the details from the Slackware 14.2 ChangeLog:
+--------------------------+
patches/packages/ruby-2.2.10-i586-1_slack14.2.txz: Upgraded.
This release includes some bug fixes and some security fixes:
HTTP response splitting in WEBrick.
Unintentional file and directory creation with directory traversal in
tempfile and tmpdir.
DoS by large request in WEBrick.
Buffer under-read in String#unpack.
Unintentional socket creation by poisoned NUL byte in UNIXServer
and UNIXSocket.
Unintentional directory traversal by poisoned NUL byte in Dir.
Multiple vulnerabilities in RubyGems.
For more information, see:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17742
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6914
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8777
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8778
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8779
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8780
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project!

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/ruby-2.2.10-i586-1_slack14.2.txz

Updated package for Slackware x86_64 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/ruby-2.2.10-x86_64-1_slack14.2.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/d/ruby-2.5.1-i586-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/d/ruby-2.5.1-x86_64-1.txz


MD5 signatures:
+-------------+

Slackware 14.2 package:
6d9fe0b738bd69415ef3baa099ff080c ruby-2.2.10-i586-1_slack14.2.txz

Slackware x86_64 14.2 package:
7c78396305daa605f770ea4d41dc3ae8 ruby-2.2.10-x86_64-1_slack14.2.txz

Slackware -current package:
344aff109ec8333eb9b8528e4586c93e d/ruby-2.5.1-i586-1.txz

Slackware x86_64 -current package:
7769371ca9beb48b5a8188c91cabf32f d/ruby-2.5.1-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg ruby-2.2.10-i586-1_slack14.2.txz

  Ruby Update (SSA:2018-088-01) for Slackware