CVE-2026-22863: Deno

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.6.0, node:crypto doesn't finalize cipher. The vulnerability allows an attacker to have infinite encryptions. This can lead to naive attempts at brute forcing, as well as more refined attacks with the goal to learn the server secrets. This vulnerability is fixed in 2.6.0.

Affected products

• Deno Deno: before 2.6.0 (fixed in 2.6.0)

Published 2026-01-15. Last modified 2026-06-17.