--- src/google/protobuf/parse_context.h	2026-06-12 00:26:38.000000000 +0800
+++ src/google/protobuf/parse_context.h	2026-06-28 05:48:51.000000000 +0800
@@ -1581,8 +1581,13 @@
   // continuation bit not set. In a valid varint there is only 1 such byte.
   if (end - ptr >= 16) {
     if constexpr (std::is_same_v<T, bool> && sizeof(bool) == sizeof(uint8_t)) {
-      if (absl::bit_cast<uint8_t>(false) == 0 &&  // Not constexpr on MSVC.
-          absl::bit_cast<uint8_t>(true) == 1) {
+      auto bool_as_byte = [](bool b) -> uint8_t {
+        uint8_t v;
+        std::memcpy(&v, &b, 1);
+        return v;
+      };
+      if (bool_as_byte(false) == 0 &&  // Not constexpr on MSVC.
+          bool_as_byte(true) == 1) {
         if (VerifyBoolsAssumingLargeArray(ptr, end)) {
           // Each byte is 0 or 1.
           const int count = end - ptr;