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CVE-2025-48934

5.3 · MEDIUM

Deno is a JavaScript, TypeScript, and WebAssembly runtime.

Published Jun 4, 2025CWE-201EPSS 0.43%

Overview

CVE-2025-48934 is a medium-severity vulnerability. It was published on June 4, 2025 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocs.deno.com/api/deno/~/Deno.Env.toObjectRefdocs.deno.com/runtime/fundamentals/security/#environment-variablesGitHubgithub.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562fGitHubgithub.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753GitHubgithub.com/denoland/deno/pull/29079GitHubgithub.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789GitHubgithub.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789

How CyberStrike helps

Frequently asked questions

What is CVE-2025-48934?

CVE-2025-48934 is a medium-severity vulnerability. It was published on June 4, 2025 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-48934?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-48934?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-48934?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-48934 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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