Описание
Deno.env.toObject() ignores the variables listed in --deny-env and returns all environment variables
Summary
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.
PoC
The first example using get exits with the following error:
The second example using toObject prints all environment variables:
Impact
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.
Ссылки
- https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789
- https://nvd.nist.gov/vuln/detail/CVE-2025-48934
- https://github.com/denoland/deno/pull/29079
- https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562f
- https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753
- https://docs.deno.com/api/deno/~/Deno.Env.toObject
- https://docs.deno.com/runtime/fundamentals/security/#environment-variables
Пакеты
deno
< 2.1.13
2.1.13
deno
>= 2.2.0, < 2.2.13
2.2.13
deno_runtime
< 0.212.0
0.212.0
Связанные уязвимости
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.