diff --git a/.changeset/giant-rice-notice.md b/.changeset/giant-rice-notice.md
new file mode 100644
index 000000000000..a70e2db89593
--- /dev/null
+++ b/.changeset/giant-rice-notice.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Prevent `Host` header from being incorrectly inherited by requests made from `load`'s `fetch` during SSR
diff --git a/packages/kit/src/runtime/server/page/load_node.js b/packages/kit/src/runtime/server/page/load_node.js
index 482267d5a816..650d639bc1ba 100644
--- a/packages/kit/src/runtime/server/page/load_node.js
+++ b/packages/kit/src/runtime/server/page/load_node.js
@@ -96,9 +96,15 @@ export async function load_node({
 
 				// merge headers from request
 				for (const [key, value] of event.request.headers) {
-					if (opts.headers.has(key)) continue;
-					if (key === 'cookie' || key === 'authorization' || key === 'if-none-match') continue;
-					opts.headers.set(key, value);
+					if (
+						key !== 'authorization' &&
+						key !== 'cookie' &&
+						key !== 'host' &&
+						key !== 'if-none-match' &&
+						!opts.headers.has(key)
+					) {
+						opts.headers.set(key, value);
+					}
 				}
 
 				opts.headers.set('referer', event.url.href);