CVE-2026-49411

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.

• CWE-284

• https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23Exploit, Mitigation, Third Party Advisory
• https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23Exploit, Mitigation, Third Party Advisory

Published

Jun 23, 2026

Last Modified

Jun 26, 2026

Status

Modified

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