Summary iPlain-English security verdict for Svelte, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Svelte currently scores 92/100 — healthy. No tracked vulnerabilities are currently known to be exploited in the wild. The latest supported release is 5.56.3. It's on the latest patch with no significant known issues — keep it current.
Disclosure trend iNew CVEs published for Svelte each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
No urgent unpatched issues identified. ✓
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Versions & lifecycle iWhen each release line stops receiving security patches (end-of-life). After EOL there are no more fixes — plan upgrades before these dates.
How long each Svelte release line is supported — and when it sunsets. Select a line for its full report.
Full Svelte end-of-life dates & support timeline →
5 latest 5.56.3 Supported 5.56.3 → 4 latest 4.2.20 End of life ended 2024-10-194.2.20 → 3 latest 3.59.2 End of life ended 2023-06-223.59.2 → 2 latest 2.16.1 End of life ended 2019-04-212.16.1 → 1 latest 1.64.1 End of life ended 2018-04-191.64.1 → See all upcoming end-of-life dates →Frequently asked
Is Svelte safe and patched?
Svelte currently scores 92/100 — healthy. No tracked vulnerabilities are currently known to be exploited in the wild. The latest supported release is 5.56.3. It's on the latest patch with no significant known issues — keep it current.
What should I do about Svelte now?
Upgrade Svelte to the latest supported release (5.56.3) or later and apply available security updates, then confirm against Svelte's official advisory.
When does Svelte reach end-of-life?
The latest supported Svelte release is 5.56.3. After end-of-life a release no longer receives security patches.
Which versions of Svelte are still receiving security updates?
Supported Svelte release lines (latest 5.56.3): 5. End-of-life releases no longer receive security patches.
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Svelte's official advisory before you patch or upgrade — Svelte official site ↗