CVE-2026-49411

Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks

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.

Affected

denoland · deno

CVSS v3.1 GITHUB

6.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS

0.16% chance of exploitation in the next 30 days, 4th percentile

Published

2026-06-23

Updated

2026-06-26

Proof-of-concept exploits (1)

• advisories/GHSA-v8fw-85r8-5m23

Security advisories

• denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23

References

• CVE Record
• NVD entry