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5.9 Medium

CVE-2026-42567 Svelte is a performance oriented web framework

Description

Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.

Affected products and versions

Product Affected versions Fixed in
svelte 5.51 5.51.5 → < 5.55.7 5.55.7

References

Timeline

  1. Published
  2. Last modified

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CVE-2026-42599 Svelte is a performance oriented web framework 5.1 Medium CVE-2026-42573 Svelte is a performance oriented web framework 5.3 Medium CVE-2026-27902 Svelte performance oriented web framework 5.3 Medium CVE-2026-27901 Svelte performance oriented web framework 5.3 Medium
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