diff -r 5cf98daad7b1 -r 8c1d0fe1f431 mercurial/configitems.py
--- a/mercurial/configitems.py	Thu Oct 12 00:19:12 2017 +0200
+++ b/mercurial/configitems.py	Thu Oct 12 00:20:41 2017 +0200
@@ -454,6 +454,10 @@
     default=dynamicdefault,
     generic=True,
 )
+coreconfigitem('hostfingerprints', '.*',
+    default=list,
+    generic=True,
+)
 coreconfigitem('hostsecurity', 'ciphers',
     default=None,
 )