CVE-2026-49411: Deno

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.0, the Node.js compatibility TCP path checked the permission against the original hostname string before resolution and then did not re-check after resolution. A caller could therefore pass a numeric alias of an IP address (for example the decimal integer 2130706433 or the hex form 0x7f000001, both of which resolve to 127.0.0.1) and reach the denied destination through node:net.connect or node:http.request's { host, port } options form. This vulnerability is fixed in 2.8.0.

Affected products

• Deno Deno: from 2.7.14, before 2.8.0 (fixed in 2.8.0)

Published 2026-06-23. Last modified 2026-06-26.