Svelte 4 · Version Status
Svelte 4 End of Life Date
Svelte 4 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Svelte 4 is past end of life. This version no longer receives security patches. 612 days past EOL — migrate to a supported version immediately.
EOL Date
Oct 19, 2024
612 days past EOL
Latest Release
4.2.20
Standard release
Release Date
Jun 22, 2023
Svelte 4 series
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
Extended Support
Extended Svelte 4 support is available
Commercial vendors offer security patches beyond EOL — compare your options.
Compare Options →
| Version | Latest | EOL Date | Status |
|---|
| 1 |
1.64.1 |
Apr 19, 2018 |
EOL |
| 2 |
2.16.1 |
Apr 21, 2019 |
EOL |
| 3 |
3.59.2 |
Jun 22, 2023 |
EOL |
| → 4 |
4.2.20 |
Oct 19, 2024 |
EOL |
| 5 |
5.56.3 |
EOL |
Active |
What does Svelte 4 end of life mean?
When Svelte 4 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Svelte 4 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Svelte 5 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Svelte 4 reach end of life?
Svelte 4 reached end of life on October 19, 2024. This version is no longer receiving security patches.
Is Svelte 4 still supported?
No. Svelte 4 reached end of life on October 19, 2024 and is no longer receiving security patches.
What should I upgrade to from Svelte 4?
The recommended upgrade from Svelte 4 is
Svelte 5 — the latest actively supported version. Check the
Svelte full timeline for all supported versions.
What are the security risks of running Svelte 4 past EOL?
When Svelte 4 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Svelte should migrate immediately or implement compensating controls.