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@renovate renovate bot commented Jan 15, 2026

This PR contains the following updates:

Package Change Age Confidence
svelte (source) 5.46.15.46.4 age confidence

GitHub Vulnerability Alerts

CVE-2025-15265

Summary

An XSS vulnerability exists in Svelte 5.46.0-2 resulting from improper escaping of hydratable keys. If these keys incorporate untrusted user input, arbitrary JavaScript can be injected into server-rendered HTML.

Details

When using the hydratable function, the first argument is used as a key to uniquely identify the data, such that the value is not regenerated in the browser.

This key is embedded into a <script> block in the server-rendered <head> without escaping unsafe characters. A malicious key can break out of the script context and inject arbitrary JavaScript into the HTML response.

Impact

This is a cross-site scripting vulnerability affecting applications that have the experimental.async flag enabled and use hydratable with keys incorporating untrusted user input.

  • Impact: Arbitrary JS execution in the client’s browser.
  • Exploitability: Remote, single-request if key is attacker-controlled.
  • Typical Outcomes:
    • Session/token theft
    • DOM defacement
    • CSRF bypass via injected JS
    • Account takeover depending on cookie/session strategy

Affected applications should upgrade to a patched version immediately.


Release Notes

sveltejs/svelte (svelte)

v5.46.4

Compare Source

Patch Changes

v5.46.3

Compare Source

Patch Changes
  • fix: reconnect clean deriveds when they are read in a reactive context (#​17362)

  • fix: don't transform references of function declarations in legacy mode (#​17431)

  • fix: notify deriveds of changes to sources inside forks (#​17437)

  • fix: always reconnect deriveds in get, when appropriate (#​17451)

  • fix: prevent derives without dependencies from ever re-running (286b40c4526ce9970cb81ddd5e65b93b722fe468)

  • fix: correctly update writable deriveds inside forks (#​17437)

  • fix: remove $inspect calls after await expressions when compiling for production server code (#​17407)

  • fix: clear batch between runs (#​17424)

  • fix: adjust loc property of Program nodes created from <script> elements (#​17428)

  • fix: don't revert source to UNINITIALIZED state when time travelling (#​17409)


Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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This PR was generated by Mend Renovate. View the repository job log.

@renovate renovate bot added the dependencies Anything related to dependency issues or updates. label Jan 15, 2026
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changeset-bot bot commented Jan 15, 2026

⚠️ No Changeset found

Latest commit: ed375f0

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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@renovate renovate bot force-pushed the renovate/npm-svelte-vulnerability branch from 4d8a8f8 to 9f7dca6 Compare January 16, 2026 15:46
@renovate renovate bot force-pushed the renovate/npm-svelte-vulnerability branch from 9f7dca6 to ed375f0 Compare January 19, 2026 15:15
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