Security Advisory

CVE-2026-49859

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-23 17:14:16

Last updated 2026-06-24 14:23:09

Assigner GitHub_M

CVSS score 5.2

State PUBLISHED

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, when fetch() was called, Deno checked the destination hostname against --deny-net rules but did not re-check the IP addresses that hostname resolved to. An attacker-controlled script could use a specially crafted domain name that passes the hostname check yet resolves to a denied IP, bypassing the network restriction entirely. This vulnerability is fixed in 2.8.1.

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