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Medium · 6.5 CVE-2026-49411 EUVD-2026-38544GHSA-v8fw-85r8-5m23

Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks

Published Jun 23, 2026 · Updated Jun 26, 2026 · Assigned by GitHub_M

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

VendorProductAffectedFixed
denoland deno < 2.8.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
crates.io deno < 2.8.0 2.8.0 GHSA-v8fw-85r8-5m23

References