fix(deps): update dependency svelte to v5.51.5 [security]

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This PR contains the following updates:

Package	Change	Age	Confidence
svelte (source)	5.50.3 → 5.51.5

GitHub Vulnerability Alerts

CVE-2026-27119

In certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected.

CVE-2026-27121

Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers.

CVE-2026-27122

When using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected.

CVE-2026-27125

In server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected.

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Release Notes

sveltejs/svelte (svelte)

v5.51.5

Compare Source

Patch Changes

• fix: check to make sure svelte:element tags are valid during SSR (73098bb26c6f06e7fd1b0746d817d2c5ee90755f)

• fix: misc option escaping and backwards compatibility (#​17741)

• fix: strip event handlers during SSR (a0c7f289156e9fafaeaf5ca14af6c06fe9b9eae5)

• fix: replace usage of for in with for of Object.keys (f89c7ddd7eebaa1ef3cc540400bec2c9140b330c)

• fix: always escape option body in SSR (f7c80da18c215e3727c2a611b0b8744cc6e504c5)

• chore: upgrade devalue (#​17739)

v5.51.4

Compare Source

Patch Changes

• chore: proactively defer effects in pending boundary (#​17734)

• fix: detect and error on non-idempotent each block keys in dev mode (#​17732)

v5.51.3

Compare Source

Patch Changes

• fix: prevent event delegation logic conflicting between svelte instances (#​17728)

• fix: treat CSS attribute selectors as case-insensitive for HTML enumerated attributes (#​17712)

• fix: locate Rollup annontaion friendly to JS downgraders (#​17724)

• fix: run effects in pending snippets (#​17719)

v5.51.2

Compare Source

Patch Changes

• fix: take async into consideration for dev delegated handlers (#​17710)

• fix: emit state_referenced_locally warning for non-destructured props (#​17708)

v5.51.1

Compare Source

Patch Changes

• fix: don't crash on undefined document.contentType (#​17707)

• fix: use symbols for encapsulated event delegation (#​17703)

v5.51.0

Compare Source

Minor Changes

• feat: Use TrustedTypes for HTML handling where supported (#​16271)

Patch Changes

• fix: sanitize template-literal-special-characters in SSR attribute values (#​17692)

• fix: follow-up formatting in print() — flush block-level elements into separate sequences (#​17699)

• fix: preserve delegated event handlers as long as one or more root components are using them (#​17695)

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