diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 525475b60b..e9e2516d58 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -5168,8 +5168,9 @@ A jump table for the options with a short description can be found at |Q_op|.
 	Note that such processing is done after |:set| did its own round of 
 	unescaping, so to keep yourself sane use |:let-&| like shown above.
 							*shell-powershell*
-	To use powershell (on Windows): >
-		set shell=powershell shellquote=( shellpipe=\| shellxquote=
+	To use powershell: >
+		let &shell = has('win32') ? 'powershell' : 'pwsh'
+		set shellquote= shellpipe=\| shellxquote=
 		set shellcmdflag=-NoLogo\ -NoProfile\ -ExecutionPolicy\ RemoteSigned\ -Command
 		set shellredir=\|\ Out-File\ -Encoding\ UTF8
 
diff --git a/src/nvim/screen.c b/src/nvim/screen.c
index 4b4b2c416f..05e3d90c8f 100644
--- a/src/nvim/screen.c
+++ b/src/nvim/screen.c
@@ -2692,8 +2692,8 @@ win_line (
     off += col;
   }
 
-  // wont highlight after 1024 columns
-  int term_attrs[1024] = {0};
+  // wont highlight after TERM_ATTRS_MAX columns
+  int term_attrs[TERM_ATTRS_MAX] = { 0 };
   if (wp->w_buffer->terminal) {
     terminal_get_line_attributes(wp->w_buffer->terminal, wp, lnum, term_attrs);
     extra_check = true;
@@ -4030,7 +4030,7 @@ win_line (
         int n = wp->w_p_rl ? -1 : 1;
         while (col >= 0 && col < grid->Columns) {
           schar_from_ascii(linebuf_char[off], ' ');
-          linebuf_attr[off] = term_attrs[vcol];
+          linebuf_attr[off] = vcol >= TERM_ATTRS_MAX ? 0 : term_attrs[vcol];
           off += n;
           vcol += n;
           col += n;
diff --git a/src/nvim/screen.h b/src/nvim/screen.h
index 61ed98247d..754ab06bec 100644
--- a/src/nvim/screen.h
+++ b/src/nvim/screen.h
@@ -32,6 +32,9 @@ EXTERN ScreenGrid default_grid INIT(= SCREEN_GRID_INIT);
 
 #define DEFAULT_GRID_HANDLE 1  // handle for the default_grid
 
+// Maximum columns for terminal highlight attributes
+#define TERM_ATTRS_MAX 1024
+
 /// Status line click definition
 typedef struct {
   enum {
diff --git a/src/nvim/terminal.c b/src/nvim/terminal.c
index 7609006906..3de6f19cda 100644
--- a/src/nvim/terminal.c
+++ b/src/nvim/terminal.c
@@ -588,6 +588,7 @@ void terminal_get_line_attributes(Terminal *term, win_T *wp, int linenr,
     return;
   }
 
+  width = MIN(TERM_ATTRS_MAX, width);
   for (int col = 0; col < width; col++) {
     VTermScreenCell cell;
     bool color_valid = fetch_cell(term, row, col, &cell);
diff --git a/test/functional/helpers.lua b/test/functional/helpers.lua
index bd36bac062..dbaedd6f60 100644
--- a/test/functional/helpers.lua
+++ b/test/functional/helpers.lua
@@ -500,9 +500,20 @@ function module.source(code)
 end
 
 function module.set_shell_powershell()
+  local shell = iswin() and 'powershell' or 'pwsh'
+  if not module.eval('executable("'..shell..'")') then
+    error(shell..' is not executable')
+  end
+  local aliases = iswin() and {'cat', 'sleep'} or {}
+  local cmd = ''
+  for _, alias in ipairs(aliases) do
+    cmd = cmd .. 'Remove-Item -Force alias:' .. alias .. ';'
+  end
   module.source([[
-    set shell=powershell shellquote=( shellpipe=\| shellredir=> shellxquote=
-    let &shellcmdflag = '-NoLogo -NoProfile -ExecutionPolicy RemoteSigned -Command Remove-Item -Force alias:sleep; Remove-Item -Force alias:cat;'
+    let &shell = ']]..shell..[['
+    set shellquote= shellpipe=\| shellxquote=
+    let &shellredir = '| Out-File -Encoding UTF8'
+    let &shellcmdflag = '-NoLogo -NoProfile -ExecutionPolicy RemoteSigned -Command ]]..cmd..[['
   ]])
 end
 
diff --git a/test/functional/terminal/buffer_spec.lua b/test/functional/terminal/buffer_spec.lua
index c6ea0c0e6b..fb6e0d0e94 100644
--- a/test/functional/terminal/buffer_spec.lua
+++ b/test/functional/terminal/buffer_spec.lua
@@ -264,3 +264,12 @@ describe('No heap-buffer-overflow when using', function()
     feed_command('bdelete!')
   end)
 end)
+
+describe('No heap-buffer-overflow when', function()
+  it('set nowrap and send long line #11548', function()
+    feed_command('set nowrap')
+    feed_command('autocmd TermOpen * startinsert')
+    feed_command('call feedkeys("4000ai\\<esc>:terminal!\\<cr>")')
+    eq(2, eval('1+1'))
+  end)
+end)
diff --git a/test/functional/ui/output_spec.lua b/test/functional/ui/output_spec.lua
index c028f44b44..c5d3e536ad 100644
--- a/test/functional/ui/output_spec.lua
+++ b/test/functional/ui/output_spec.lua
@@ -10,6 +10,7 @@ local iswin = helpers.iswin
 local clear = helpers.clear
 local command = helpers.command
 local nvim_dir = helpers.nvim_dir
+local set_shell_powershell = helpers.set_shell_powershell
 
 describe("shell command :!", function()
   local screen
@@ -230,4 +231,19 @@ describe("shell command :!", function()
       ]])
     end)
   end)
+  if iswin() or eval('executable("pwsh")') == 1 then
+    it('powershell supports literal strings', function()
+      set_shell_powershell()
+      local screen = Screen.new(30, 4)
+      screen:attach()
+      feed_command([[!'echo $a']])
+      screen:expect{any='\necho %$a', timeout=10000}
+      feed_command([[!$a = 1; echo '$a']])
+      screen:expect{any='\n%$a', timeout=10000}
+      feed_command([[!"echo $a"]])
+      screen:expect{any='\necho', timeout=10000}
+      feed_command([[!$a = 1; echo "$a"]])
+      screen:expect{any='\n1', timeout=10000}
+    end)
+  end
 end)
diff --git a/third-party/CMakeLists.txt b/third-party/CMakeLists.txt
index 4cd18efcf3..a31bd88189 100644
--- a/third-party/CMakeLists.txt
+++ b/third-party/CMakeLists.txt
@@ -160,8 +160,8 @@ set(UNIBILIUM_SHA256 29815283c654277ef77a3adcc8840db79ddbb20a0f0b0c8f648bd8cd49a
 set(LIBTERMKEY_URL http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.21.1.tar.gz)
 set(LIBTERMKEY_SHA256 cecbf737f35d18f433c8d7864f63c0f878af41f8bd0255a3ebb16010dc044d5f)
 
-set(LIBVTERM_URL https://github.com/neovim/libvterm/archive/7c72294d84ce20da4c27362dbd7fa4b08cfc91da.tar.gz)
-set(LIBVTERM_SHA256 f30c4d43e0c6db3e0912daf7188d98fbf6ee88f97589d72f6f304e5db48826a8)
+set(LIBVTERM_URL http://www.leonerd.org.uk/code/libvterm/libvterm-0.1.4.tar.gz)
+set(LIBVTERM_SHA256 bc70349e95559c667672fc8c55b9527d9db9ada0fb80a3beda533418d782d3dd)
 
 set(LUV_VERSION 1.30.0-0)
 set(LUV_URL https://github.com/luvit/luv/archive/${LUV_VERSION}.tar.gz)
diff --git a/third-party/cmake/BuildLibvterm.cmake b/third-party/cmake/BuildLibvterm.cmake
index 61c1c90fa6..c3485dac25 100644
--- a/third-party/cmake/BuildLibvterm.cmake
+++ b/third-party/cmake/BuildLibvterm.cmake
@@ -27,7 +27,6 @@ function(BuildLibvterm)
       -DUSE_EXISTING_SRC_DIR=${USE_EXISTING_SRC_DIR}
       -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/DownloadAndExtractFile.cmake
     PATCH_COMMAND "${_libvterm_PATCH_COMMAND}"
-    CONFIGURE_COMMAND ""
     BUILD_IN_SOURCE 1
     CONFIGURE_COMMAND "${_libvterm_CONFIGURE_COMMAND}"
     BUILD_COMMAND "${_libvterm_BUILD_COMMAND}"