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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History
Tue, 23 Jun 2026 17:30:00 +0000
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| 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. | |
| Title | Deno: `fetch()` API sandbox bypass via missing DNS resolution check | |
| Weaknesses | CWE-693 CWE-918 |
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-23T17:14:16.888Z
Reserved: 2026-06-01T22:03:19.640Z
Link: CVE-2026-49859
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-06-23T21:30:07Z