The following issues were found

shell/common/v8_value_converter.cc
1 issues
memcpy - Does not check for buffer overflows when copying to destination
Security

Line: 262 Column: 3 CWE codes: 120
Suggestion: Make sure destination can always hold the source data 

                auto array_buffer = v8::ArrayBuffer::New(isolate, length);
  std::shared_ptr<v8::BackingStore> backing_store =
      array_buffer->GetBackingStore();
  memcpy(backing_store->Data(), data, length);
  // From this point, if something goes wrong(can't find Buffer class for
  // example) we'll simply return a Uint8Array based on the created ArrayBuffer.
  // This can happen if no preload script was specified to the renderer.
  gin_helper::Dictionary global(isolate, context->Global());
  v8::Local<v8::Value> buffer_value;

Reported by FlawFinder.

shell/renderer/electron_sandboxed_renderer_client.cc
1 issues
char - Statically-sized arrays can be improperly restricted, leading to potential overflows or other issues
Security

Line: 76 Column: 5 CWE codes: 119 120
Suggestion: Perform bounds checking, use functions that limit length, or ensure that the size is larger than the maximum possible length 

                auto* mod = node::binding::get_linked_module(module_key.c_str());

  if (!mod) {
    char errmsg[1024];
    snprintf(errmsg, sizeof(errmsg), "No such module: %s", module_key.c_str());
    margs->ThrowError(errmsg);
    return exports;
  }

Reported by FlawFinder.