Skip to content

Conversation

@renovate
Copy link

@renovate renovate bot commented Jan 31, 2026

This PR contains the following updates:

Package Change Age Adoption Passing Confidence
svelte (source) 5.46.15.46.4 age adoption passing 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.

🔕 Ignore: Close this PR and you won't be reminded about this update again.


  • If you want to rebase/retry this PR, check this box

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

@Exeloo Exeloo closed this Jan 31, 2026
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

1 participant