Deno 1 End of Life Date
Deno 1 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
Deno 1 was released on April 13, 2020 and support ended on October 9, 2024 — a supported lifespan of 4 years and 6 months, longer than the 3 months median for Deno releases. It was not an LTS release; Deno reserves longer patch windows for its LTS versions. The last patch it will ever receive is 1.46.3, published September 4, 2024 — 35 days before support ended. It has been without security patches for 1 year and 10 months. 9 newer Deno releases have shipped since.
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When Deno 1 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 Deno 1 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Deno 2.9 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.