CVE-2025-48934: Deno

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to versions 2.1.13 and 2.2.13, the `Deno.env.toObject` method ignores any variables listed in the `--deny-env` option of the `deno run` command. When looking at the documentation of the `--deny-env` option this might lead to a false impression that variables listed in the option are impossible to read. Software relying on the combination of both flags to allow access to most environment variables except a few sensitive ones will be vulnerable to malicious code trying to steal secrets using the `Deno.env.toObject()` method. Versions 2.1.13 and 2.2.13 contains a patch.

Affected products

• Deno Deno: before 2.1.13 (fixed in 2.1.13); from 2.2.0, before 2.2.13 (fixed in 2.2.13)

Published 2025-06-04. Last modified 2026-06-17.