And in case it helps more, here's the full patch.
diff -Nur puppet-2.7.18.orig/lib/puppet/ssl/base.rb puppet-2.7.18/lib/puppet/ssl/base.rb
--- puppet-2.7.18.orig/lib/puppet/ssl/base.rb 2012-07-10 00:36:29.000000000 +0100
+++ puppet-2.7.18/lib/puppet/ssl/base.rb 2013-04-13 23:01:44.245916200 +0100
@@ -6,7 +6,7 @@
SEPARATOR = "\n---\n"
# Only allow printing ascii characters, excluding /
- VALID_CERTNAME = /\A[ -.0-~]+\Z/
+ VALID_CERTNAME = /\A[ -.0-~\/]+\Z/
def self.from_multiple_s(text)
text.split(SEPARATOR).collect { |inst| from_s(inst) }
