CVE-2025-48934

Name: CVE-2025-48934
Creator: NVD / NIST
Published: 2025-06-04T20:15:24.163+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2025-48934 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

CVSS 4.0

5.5/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.36%

27.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-201

Affected Software

Vendor	Product	Versions
Deno	Deno	< 2.1.13
Deno	Deno	>= 2.2.0, < 2.2.13

References

https://docs.deno.com/api/deno/~/Deno.Env.toObjectProduct
https://docs.deno.com/runtime/fundamentals/security/#environment-variablesProduct
https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562fPatch
https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753Patch
https://github.com/denoland/deno/pull/29079Issue Tracking, Patch
https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789Exploit, Vendor Advisory
https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789Exploit, Vendor Advisory

Timeline

Published: Jun 4, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-48934?

How severe is CVE-2025-48934?

CVE-2025-48934 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2025-48934?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-48934?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST