{"id":"CVE-2026-49983","revision":"cbc0c6344c20493c93643750af3cdae7","records":[{"revision":"cbc0c6344c20493c93643750af3cdae7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-49983","aliases":[],"title":"Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access","description":"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 — 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.","state":0,"publishedAt":"2026-06-23T17:16:17.026+00:00","modifiedAt":"2026-06-23T17:54:51.686+00:00","affected":[{"ecosystem":"Vendor product","name":"deno","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"denoland\",\n                    \"product\": \"deno\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.8.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":5.2,"severity":"MEDIUM"}],"references":["https://github.com/denoland/deno/security/advisories/GHSA-4c8g-jvcx-v4hv"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-49983","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-49983","identifiers":["CVE-2026-49983"]},"retained":false,"historicalAffected":[]}],"coverage":[]}