medium6.5
CVE-2026-49411
Deno: Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | deno | <= 2.7.14 | 2.8.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Deno | Deno | from 2.7.14 before 2.8.0 |