CVE-2026-49411
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In Deno prior to version 2.8.0, the Node.js compatibility TCP path checked the permission against the original hostname string before resolution and then did not re-check after resolution. A caller could pass a numeric alias of an IP address (e.g., the decimal integer 2130706433 or the hex form 0x7f000001, both resolving to 127.0.0.1) and bypass the restriction using the { host, port } options in node:net.connect or node:http.request.
Risk Assessment
The risk involves bypassing Deno's security mechanisms, allowing access to restricted network resources, potentially leading to data leakage or unauthorized actions.
Recommendation
It is recommended to immediately update Deno to version 2.8.0 or later, which includes a fix for this vulnerability.
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Original NVD description (English source)
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.0, the Node.js compatibility TCP path checked the permission against the original hostname string before resolution and then did not re-check after resolution. A caller could therefore pass a numeric alias of an IP address (for example the decimal integer 2130706433 or the hex form 0x7f000001, both of which resolve to 127.0.0.1) and reach the denied destination through node:net.connect or node:http.request's { host, port } options form. This vulnerability is fixed in 2.8.0.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS