{"id":"CVE-2026-49411","aliases":["GHSA-v8fw-85r8-5m23"],"url":"https://o3.security/vulnerability/CVE-2026-49411","summary":"Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks","details":"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.","published":"2026-06-23T17:18:07.354Z","modified":"2026-08-12T03:51:40.963748493Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"},"epss":{"score":0.00158,"percentile":0.05238,"asOf":"2026-09-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"deno","fixedVersion":"2.8.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49411.json"},{"type":"ADVISORY","url":"https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49411"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.963748493Z"}}