CVE-2025-48934

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.

The following products are affected by CVE-2025-48934 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-48934.

URL	Resource
https://docs.deno.com/api/deno/~/Deno.Env.toObject
https://docs.deno.com/runtime/fundamentals/security/#environment-variables
https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562f
https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753
https://github.com/denoland/deno/pull/29079
https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789