CVE-2026-49859
MEDIUM EPSS 1.3%
Published Jun 23, 20261w ago · Modified Jun 24, 20266d ago
5.2 CVSS 3.1
Published Jun 23, 2026 1w ago
Last Modified Jun 24, 2026 6d ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality Low
Integrity Low
Availability None
Threat Intelligence
EPSS Exploit Probability
1.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 2
CWE-693
CWE-918 Server-Side Request Forgery (SSRF) Validation
References 1
- github.com https://github.com/denoland/deno/security/advisories/GHSA-cpgj-f7g3-2pp2
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.