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fix: sanitize template-literal-special-characters in SSR attribute values #17692

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Merged
Rich-Harris merged 2 commits into from
Feb 13, 2026
Merged

fix: sanitize template-literal-special-characters in SSR attribute values #17692

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e81867c
fix: sanitize template-literal-special-characters in SSR attribute va…
elliott-with-the-longest-name-on-github Feb 12, 2026
97a25c2
changeset
Rich-Harris Feb 13, 2026
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5 changes: 5 additions & 0 deletions .changeset/brave-pears-matter.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"svelte": patch
---

fix: sanitize template-literal-special-characters in SSR attribute values
6 changes: 5 additions & 1 deletion packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/utils.js
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Expand Up @@ -225,7 +225,7 @@ export function build_attribute_value(
const node = value[i];

if (node.type === 'Text') {
quasi.value.raw += trim_whitespace
quasi.value.cooked += trim_whitespace
? node.data.replace(regex_whitespaces_strict, ' ')
: node.data;
} else {
Expand All @@ -244,6 +244,10 @@ export function build_attribute_value(
}
}

for (const quasi of quasis) {
quasi.value.raw = sanitize_template_string(/** @type {string} */ (quasi.value.cooked));
}

return b.template(quasis, expressions);
}

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3 changes: 3 additions & 0 deletions ...ests/server-side-rendering/samples/attribute-template-literal-sanitization/_expected.html
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@@ -0,0 +1,3 @@
<div title="${inject} world"></div>
<div title="`backtick world"></div>
<div title="back\slash world"></div>
7 changes: 7 additions & 0 deletions ...e/tests/server-side-rendering/samples/attribute-template-literal-sanitization/main.svelte
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@@ -0,0 +1,7 @@
<script>
export let value = 'world';
</script>

<div title="&#36;&#123;inject&#125; {value}"></div>
<div title="&#96;backtick {value}"></div>
<div title="back\slash {value}"></div>
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