Vulnerability Monitor

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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.

Published

2025-06-04T20:15:24.163

Last Modified

2025-07-02T13:43:10.557

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

Weaknesses

Type: Secondary
CWE-201

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	deno	deno	< 2.1.13	Yes
Application	deno	deno	< 2.2.13	Yes

References

https://docs.deno.com/api/deno/~/Deno.Env.toObject Product ([email protected])
https://docs.deno.com/runtime/fundamentals/security/#environment-variables Product ([email protected])
https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562f Patch ([email protected])
https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753 Patch ([email protected])
https://github.com/denoland/deno/pull/29079 Issue Tracking, Patch ([email protected])
https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789 Exploit, Vendor Advisory ([email protected])
https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789 Exploit, Vendor Advisory (134c704f-9b21-4f2e-91b3-4a467353bcc0)