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CVE-2026-49860Published

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 t…

Exact source revision recorded 27 Oct 2026 13:11:58 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

nvd · CVE-2026-49860

Published

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.

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-918

Original publisher date fields

published: 2026-06-23T18:18:04.053

lastModified: 2026-10-25T23:10:00.167

1 source CPE criteria · context only
  • cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published
23 Jun 2026 18:18:04 UTC
Source modified
25 Oct 2026 23:10:00 UTC
Observed here
27 Oct 2026 13:11:58 UTC
Source terms
NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 5.2 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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Sources read 7 Nov 20:22 UTC · 275 of 275 readable · 274 fully read · documentation 469/469 current

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