CVE-2026-49411

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.0 / Impact : 4.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23	Exploit Mitigation Third Party Advisory
https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23	Exploit Mitigation Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*

History

25 Oct 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) Deno es un entorno de ejecución de JavaScript, TypeScript y WebAssembly. Antes de la versión 2.8.0, la ruta TCP de compatibilidad con Node.js verificaba el permiso contra la cadena de nombre de host original antes de la resolución y luego no volvía a verificar después de la resolución. Un llamador podría, por lo tanto, pasar un alias numérico de una dirección IP (por ejemplo, el entero decimal 2130706433 o la forma hexadecimal 0x7f000001, ambos de los cuales se resuelven a 127.0.0.1) y alcanzar el destino denegado a través de node:net.connect o la forma de opciones { host, port } de node:http.request. Esta vulnerabilidad se corrige en la versión 2.8.0.

Information

Published : 2026-06-23 18:18

Updated : 2026-10-25 23:10

NVD link : CVE-2026-49411

Mitre link : CVE-2026-49411

CVE.ORG link : CVE-2026-49411

JSON object : View

Products Affected

deno

deno

CWE

CWE-284

Improper Access Control

NVD-CWE-noinfo

{"id": "CVE-2026-49411", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49411", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-26T18:55:45.500229Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 2.0}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "denoland", "product": "deno", "versions": [{"status": "affected", "version": "< 2.8.0"}]}]}], "published": "2026-06-23T18:18:03.440", "references": [{"url": "https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-284"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Deno es un entorno de ejecuci\u00f3n de JavaScript, TypeScript y WebAssembly. Antes de la versi\u00f3n 2.8.0, la ruta TCP de compatibilidad con Node.js verificaba el permiso contra la cadena de nombre de host original antes de la resoluci\u00f3n y luego no volv\u00eda a verificar despu\u00e9s de la resoluci\u00f3n. Un llamador podr\u00eda, por lo tanto, pasar un alias num\u00e9rico de una direcci\u00f3n IP (por ejemplo, el entero decimal 2130706433 o la forma hexadecimal 0x7f000001, ambos de los cuales se resuelven a 127.0.0.1) y alcanzar el destino denegado a trav\u00e9s de node:net.connect o la forma de opciones { host, port } de node:http.request. Esta vulnerabilidad se corrige en la versi\u00f3n 2.8.0."}], "lastModified": "2026-10-25T23:10:00.167", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CCC58C9A-9D40-4DEA-B856-50BBDEB3A701", "versionEndExcluding": "2.8.0", "versionStartIncluding": "2.7.14"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}