CVE-2025-48934

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562f ↗

Additional information

• NVD record
• https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562fPatch
• https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753Patch
• https://github.com/denoland/deno/pull/29079Patch
• https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789Advisory
• https://docs.deno.com/api/deno/~/Deno.Env.toObject
• https://docs.deno.com/runtime/fundamentals/security/#environment-variables