diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 4e4a7b4658..33bae966a7 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -777,6 +777,7 @@ cpp_no_cpp14		don't highlight C++14 standard items
 cpp_no_cpp17		don't highlight C++17 standard items
 cpp_no_cpp20		don't highlight C++20 standard items
 cpp_no_cpp23		don't highlight C++23 standard items
+cpp_no_cpp26		don't highlight C++26 standard items
 
 
 CSH							*ft-csh-syntax*
diff --git a/runtime/syntax/cpp.vim b/runtime/syntax/cpp.vim
index 1c725a4bfd..121eab2c6f 100644
--- a/runtime/syntax/cpp.vim
+++ b/runtime/syntax/cpp.vim
@@ -110,6 +110,15 @@ if !exists("cpp_no_cpp23")
   syn keyword cppType		float16_t float32_t float64_t float128_t bfloat16_t
 endif
 
+" C++ 26 extensions
+if !exists("cpp_no_cpp26")
+  " attribute [[ ... ]] with optional value expr, eg [[=foo{1}]]
+  syn region cppAttribute	matchgroup=cppAttributeBracket start="\w\@1<!\[\[" end="\]\]" contains=TOP,@Spell
+  syn match cppReflect		"\^\^"
+  syn match cppSpliceBracket	"\[:\|:\]"
+  syn keyword cppStatement	contract_assert
+endif
+
 " The minimum and maximum operators in GNU C++
 syn match cppMinMax "[<>]?"
 
@@ -134,6 +143,9 @@ hi def link cppString		String
 hi def link cppNumber		Number
 hi def link cppFloat		Number
 hi def link cppModule		Include
+hi def link cppAttributeBracket	Special
+hi def link cppReflect		Operator
+hi def link cppSpliceBracket	Special
 
 let b:current_syntax = "cpp"