Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M
CVE-2026-49411Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks
Medium 6.5
In plain English
A medium-severity improper access control in deno from denoland. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Official description
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 (as reported)
Weakness: CWE-284 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
References
- https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23 x_refsource_CONFIRM