CVE-2026-49983

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{"affected": [{"affectedData": [{"product": "deno", "vendor": "denoland", "versions": [{"status": "affected", "version": "< 2.8.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*", "matchCriteriaId": "4AB91EA0-218F-426D-AD0E-A8B3A2F0212E", "versionEndExcluding": "2.8.1", "versionStartIncluding": "2.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, environment access is gated by the env permission. You can deny it with --deny-env, or restrict it to a specific allowlist with --allow-env=FOO,BAR. The expectation is that a program running without env permission cannot change process.env. process.loadEnvFile() (the Node-compatible API for loading variables from a .env file) does not honor this. It only checks that the program has read permission for the dotenv file, then writes every key in that file into the process environment \u2014 even when env access is denied. In effect, --allow-read plus a writable or attacker-controlled .env file is enough to defeat --deny-env. This vulnerability is fixed in 2.8.1."}, {"lang": "es", "value": "Deno es un entorno de ejecuci\u00f3n de JavaScript, TypeScript y WebAssembly. Antes de la versi\u00f3n 2.8.1, el acceso al entorno est\u00e1 controlado por el permiso env. Se puede denegar con --deny-env, o restringirlo a una lista de permitidos espec\u00edfica con --allow-env=FOO,BAR. La expectativa es que un programa que se ejecuta sin el permiso env no pueda cambiar process.env. process.loadEnvFile() (la API compatible con Node para cargar variables de un archivo .env) no respeta esto. Solo verifica que el programa tenga permiso de lectura para el archivo dotenv, luego escribe cada clave de ese archivo en el entorno del proceso, incluso cuando el acceso env est\u00e1 denegado. En efecto, --allow-read m\u00e1s un archivo .env escribible o controlado por el atacante es suficiente para eludir --deny-env. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 2.8.1."}], "id": "CVE-2026-49983", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49983", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-23T17:54:45.354967Z", "version": "2.0.3"}}]}, "published": "2026-06-23T18:18:04.190", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/denoland/deno/security/advisories/GHSA-4c8g-jvcx-v4hv"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

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