diff --git a/runtime/autoload/gzip.vim b/runtime/autoload/gzip.vim
index 95dd906..ac9e37b 100644
--- a/runtime/autoload/gzip.vim
+++ b/runtime/autoload/gzip.vim
@@ -10,12 +10,17 @@
 fun s:check(cmd)
   let name = substitute(a:cmd, '\(\S*\).*', '\1', '')
   if !exists("s:have_" . name)
+    " safety check, don't execute anything from the current directory
+    let f = fnamemodify(exepath(name), ":p:h") !=# getcwd()
+    if !f
+      echoerr "Warning: NOT executing " .. name .. " from current directory!"
+    endif
     let e = executable(name)
     if e < 0
       let r = system(name . " --version")
       let e = (r !~ "not found" && r != "")
     endif
-    exe "let s:have_" . name . "=" . e
+    exe "let s:have_" . name . "=" . (e && f)
   endif
   exe "return s:have_" . name
 endfun
diff --git a/runtime/autoload/zip.vim b/runtime/autoload/zip.vim
index 8dda30c..0331a54 100644
--- a/runtime/autoload/zip.vim
+++ b/runtime/autoload/zip.vim
@@ -57,6 +57,10 @@
  let g:zip_extractcmd= g:zip_unzipcmd
 endif
 
+if fnamemodify(exepath(g:zip_unzipcmd), ":p:h") ==# getcwd()
+ echoerr "Warning: NOT executing " .. g:zip_unzipcmd .. " from current directory!"
+ finish
+endif
 " ----------------
 "  Functions: {{{1
 " ----------------
diff --git a/runtime/ftplugin/perl.vim b/runtime/ftplugin/perl.vim
index d0bdbc0..edc7b96 100644
--- a/runtime/ftplugin/perl.vim
+++ b/runtime/ftplugin/perl.vim
@@ -54,7 +54,8 @@
 
 " Set this once, globally.
 if !exists("perlpath")
-    if executable("perl")
+    " safety check: don't execute perl from current directory
+    if executable("perl") && fnamemodify(exepath("perl"), ":p:h") != getcwd()
       try
 	if &shellxquote != '"'
 	    let perlpath = system('perl -e "print join(q/,/,@INC)"')
diff --git a/runtime/ftplugin/ruby.vim b/runtime/ftplugin/ruby.vim
index 8c1f477..f4e1f60 100644
--- a/runtime/ftplugin/ruby.vim
+++ b/runtime/ftplugin/ruby.vim
@@ -99,41 +99,51 @@
   return path
 endfunction
 
-if !exists('b:ruby_version') && !exists('g:ruby_path') && isdirectory(expand('%:p:h'))
-  let s:version_file = findfile('.ruby-version', '.;')
-  if !empty(s:version_file) && filereadable(s:version_file)
-    let b:ruby_version = get(readfile(s:version_file, '', 1), '')
-    if !has_key(g:ruby_version_paths, b:ruby_version)
-      let g:ruby_version_paths[b:ruby_version] = s:query_path(fnamemodify(s:version_file, ':p:h'))
-    endif
-  endif
+let s:execute_ruby = 1
+" Security Check, don't execute ruby from the current directory
+if fnamemodify(exepath("ruby"), ":p:h") ==# getcwd()
+  let s:execute_ruby = 0
 endif
 
-if exists("g:ruby_path")
-  let s:ruby_path = type(g:ruby_path) == type([]) ? join(g:ruby_path, ',') : g:ruby_path
-elseif has_key(g:ruby_version_paths, get(b:, 'ruby_version', ''))
-  let s:ruby_paths = g:ruby_version_paths[b:ruby_version]
-  let s:ruby_path = s:build_path(s:ruby_paths)
-else
-  if !exists('g:ruby_default_path')
-    if has("ruby") && has("win32")
-      ruby ::VIM::command( 'let g:ruby_default_path = split("%s",",")' % $:.join(%q{,}) )
-    elseif executable('ruby') && !empty($HOME)
-      let g:ruby_default_path = s:query_path($HOME)
-    else
-      let g:ruby_default_path = map(split($RUBYLIB,':'), 'v:val ==# "." ? "" : v:val')
+function SetRubyPath()
+  if !exists('b:ruby_version') && !exists('g:ruby_path') && isdirectory(expand('%:p:h'))
+    let s:version_file = findfile('.ruby-version', '.;')
+    if !empty(s:version_file) && filereadable(s:version_file) && s:execute_ruby
+      let b:ruby_version = get(readfile(s:version_file, '', 1), '')
+      if !has_key(g:ruby_version_paths, b:ruby_version)
+	let g:ruby_version_paths[b:ruby_version] = s:query_path(fnamemodify(s:version_file, ':p:h'))
+      endif
     endif
   endif
-  let s:ruby_paths = g:ruby_default_path
-  let s:ruby_path = s:build_path(s:ruby_paths)
-endif
 
-if stridx(&l:path, s:ruby_path) == -1
-  let &l:path = s:ruby_path
-endif
-if exists('s:ruby_paths') && stridx(&l:tags, join(map(copy(s:ruby_paths),'v:val."/tags"'),',')) == -1
-  let &l:tags = &tags . ',' . join(map(copy(s:ruby_paths),'v:val."/tags"'),',')
-endif
+  if exists("g:ruby_path")
+    let s:ruby_path = type(g:ruby_path) == type([]) ? join(g:ruby_path, ',') : g:ruby_path
+  elseif has_key(g:ruby_version_paths, get(b:, 'ruby_version', '')) && s:execute_ruby
+    let s:ruby_paths = g:ruby_version_paths[b:ruby_version]
+    let s:ruby_path = s:build_path(s:ruby_paths)
+  else
+    if !exists('g:ruby_default_path')
+      if has("ruby") && has("win32")
+	ruby ::VIM::command( 'let g:ruby_default_path = split("%s",",")' % $:.join(%q{,}) )
+      elseif executable('ruby') && !empty($HOME) && s:execute_ruby
+	let g:ruby_default_path = s:query_path($HOME)
+      else
+	let g:ruby_default_path = map(split($RUBYLIB,':'), 'v:val ==# "." ? "" : v:val')
+      endif
+    endif
+    let s:ruby_paths = g:ruby_default_path
+    let s:ruby_path = s:build_path(s:ruby_paths)
+  endif
+
+  if stridx(&l:path, s:ruby_path) == -1
+    let &l:path = s:ruby_path
+  endif
+  if exists('s:ruby_paths') && stridx(&l:tags, join(map(copy(s:ruby_paths),'v:val."/tags"'),',')) == -1
+    let &l:tags = &tags . ',' . join(map(copy(s:ruby_paths),'v:val."/tags"'),',')
+  endif
+endfunction
+
+call SetRubyPath()
 
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
   let b:browsefilter = "Ruby Source Files (*.rb)\t*.rb\n" .
diff --git a/runtime/ftplugin/zig.vim b/runtime/ftplugin/zig.vim
index 5f453fc..cd18bfe 100644
--- a/runtime/ftplugin/zig.vim
+++ b/runtime/ftplugin/zig.vim
@@ -39,7 +39,9 @@
 
 let &l:define='\v(<fn>|<const>|<var>|^\s*\#\s*define)'
 
-if !exists('g:zig_std_dir') && exists('*json_decode') && executable('zig')
+" Safety check: don't execute zip from current directory
+if !exists('g:zig_std_dir') && exists('*json_decode') &&
+    \  executable('zig') && fnamemodify(exepath("zig"), ":p:h") != getcwd()
     silent let s:env = system('zig env')
     if v:shell_error == 0
         let g:zig_std_dir = json_decode(s:env)['std_dir']
diff --git a/src/version.c b/src/version.c
index 796cff9..1e52850 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1833,
+/**/
     1832,
 /**/
     1831,