CVE-2026-49859

MediumCVSS 5.2/10Last modified Jun 29, 2026

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.

Metrics

CVSS 3.1 5.2/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-693 CWE-918

Affected software

No affected versions have been published.

Timeline

Published: Jun 23, 2026
Last modified: Jun 29, 2026
NVD status: Analyzed

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