Cloudanix VulnDB

CVE-2026-49983

Medium · 5.2

CVSS

5.2

EPSS

0.1%

Published

Jun 23, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
crates.io deno 0 2.8.1

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