chore(deps): update dependency svelte to v5.55.7 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
svelte (source)	5.54.0 → 5.55.7

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Svelte: ReDoS in <svelte:element> Tag Validation

CVE-2026-42567 / GHSA-9rmh-mm8f-r9h6

More information

Details

An internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. You are only vulnerable to this if you allow tags of unconstrained length. If your application only allows a predetermined list of tags or trims their length before passing them to svelte:element, you are safe.

Severity

• CVSS Score: 5.9 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

• https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6
• https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
• https://github.com/advisories/GHSA-9rmh-mm8f-r9h6

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Svelte: SSR XSS via Insecure Promise Serialization in hydratable

GHSA-f3cj-j4f6-wq85

More information

Details

Contents of hydratable promises were not properly stringified, potentially leading to an XSS exploit. You are vulnerable if all of the following is true:

• you are using hydratable (an experimental feature at the time of this report)
• you are passing attacker-controlled input such that a synchronous value is hydrated, then a promise value, e.g. hydratable('someKey', () => [synchronousValue, promiseValue])

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References

• https://github.com/sveltejs/svelte/security/advisories/GHSA-f3cj-j4f6-wq85
• https://github.com/sveltejs/svelte/commit/a16ebc67bbcf8f708360195687e1b2719463e1a4
• http://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
• https://github.com/advisories/GHSA-f3cj-j4f6-wq85

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

sveltejs/svelte (svelte)

v5.55.7

Compare Source

Patch Changes

• fix: prevent XSS on hydratable from user contents (a16ebc67bbcf8f708360195687e1b2719463e1a4)

• chore: bump devalue (#​18219)

• fix: disallow empty attribute names during SSR (547853e2406a2147ad7fb5ffeba95b01bd9642da)

• fix: harden regex (d2375e2ebcab5c88feb5652f1a9d621b8f06b259)

• fix: move Svelte runtime properties to symbols (e1cbbd96441e82c9eb8a23a2903c0d06d3cda991)

v5.55.6

Compare Source

Patch Changes

• fix: leave stale promises to wait for a later resolution, instead of rejecting (#​18180)

• fix: keep dependencies of $state.eager/pending (#​18218)

• fix: reapply context after transforming error during SSR (#​18099)

• fix: don't rebase just-created batches (#​18117)

• chore: allow null for pending in typings (#​18201)

• fix: flush eager effects in production (#​18107)

• fix: rethrow error of failed iterable after calling return() (#​18169)

• fix: account for proxified instance when updating bind:this (#​18147)

• fix: ensure scheduled batch is flushed if not obsolete (#​18131)

• fix: resolve stale deriveds with latest value (#​18167)

• chore: remove unnecessary increment_pending calls (#​18183)

• fix: correctly compile component member expressions for SSR (#​18192)

• fix: reset source.updated stack traces after flush (#​18196)

• fix: replacing async 'blocking' strategy with 'merging' (#​18205)

• fix: allow @debug tags to reference awaited variables (#​18138)

• fix: re-run fallback props if dependencies update (#​18146)

• fix: abort running obsolete async branches (#​18118)

• fix: ignore comments when reading CSS values (#​18153)

• fix: wrap Promise.all in save during SSR (#​18178)

• fix: ignore false-positive errors of $inspect dependencies (#​18106)

v5.55.5

Compare Source

Patch Changes

• fix: don't mark deriveds while an effect is updating (#​18124)

• fix: do not dispatch introstart event with animation of animate directive (#​18122)

v5.55.4

Compare Source

Patch Changes

• fix: never mark a child effect root as inert (#​18111)

• fix: reset context after waiting on blockers of @const expressions (#​18100)

• fix: keep flushing new eager effects (#​18102)

v5.55.3

Compare Source

Patch Changes

• fix: ensure proper HMR updates for dynamic components (#​18079)

• fix: correctly calculate @const blockers (#​18039)

• fix: freeze deriveds once their containing effects are destroyed (#​17921)

• fix: defer error boundary rendering in forks (#​18076)

• fix: avoid false positives for reactivity loss warning (#​18088)

v5.55.2

Compare Source

Patch Changes

• fix: invalidate @const tags based on visible references in legacy mode (#​18041)

• fix: handle parens in template expressions more robustly (#​18075)

• fix: disallow -- in idPrefix (#​18038)

• fix: correct types for ontoggle on <details> elements (#​18063)

• fix: don't override $destroy/set/on instance methods in dev mode (#​18034)

• fix: unskip branches of earlier batches after commit (#​18048)

• fix: never set derived.v inside fork (#​18037)

• fix: skip rebase logic in non-async mode (#​18040)

• fix: don't reset status of uninitialized deriveds (#​18054)

v5.55.1

Compare Source

Patch Changes

• fix: correctly handle bindings on the server (#​18009)

• fix: prevent hydration error on async {@​html ...} (#​17999)

• fix: cleanup superTypeParameters in ClassDeclarations/ClassExpression (#​18015)

• fix: improve duplicate module import error message (#​18016)

• fix: reschedule new effects in prior batches (#​18021)

v5.55.0

Compare Source

Minor Changes

• feat: export TweenOptions, SpringOptions, SpringUpdateOptions and Updater from svelte/motion (#​17967)

Patch Changes

• fix: ensure HMR wrapper forwards correct start/end nodes to active effect (#​17985)

v5.54.1

Compare Source

Patch Changes

• fix: hydration comments during hmr (#​17975)

• fix: null out effect.b in destroy_effect (#​17980)

• fix: group sync statements (#​17977)

• fix: defer batch resolution until earlier intersecting batches have committed (#​17162)

• fix: properly invoke iterator.return() during reactivity loss check (#​17966)

• fix: remove trailing semicolon from {@​const} tag printer (#​17962)

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​svelte@​5.55.7

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm svelte is 91.0% likely obfuscated Confidence: 0.91 Location: Package overview From: examples/api/package.json → npm/svelte@5.55.7 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/svelte@5.55.7. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

View full report