CVEvulnerability

CVE-2026-49860

5.2 MEDIUM Published 2026-06-23 Modified 2026-10-25 Official page ↗
Status
Analyzed
Published
2026-06-23
Last modified
2026-10-25
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.2 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weaknesses
CWE-918

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, when a WebSocket connection was opened, 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.

Affected configurations

• deno deno (< 2.8.1)

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References