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CVE-2025-48934— Deno.env.toObject() ignores the variables listed in --deny-env and returns all environment variables

Quick assessment

Affected
denoland deno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deno是Deno开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno 2.1.13之前版本和2.2.13之前版本存在安全漏洞，该漏洞源于Deno.env.toObject方法忽略deny-env选项，可能导致敏感信息泄露。

AI Predicted 7.5 Difficulty: Easy EPSS 0.37% · P31

Possible ATT&CK Techniques 1 AI

T1056 · Input Capture
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I. Basic Information for CVE-2025-48934

Vulnerability Information
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Vulnerability Title
Deno.env.toObject() ignores the variables listed in --deny-env and returns all environment variables
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Deno 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deno是Deno开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno 2.1.13之前版本和2.2.13之前版本存在安全漏洞，该漏洞源于Deno.env.toObject方法忽略deny-env选项，可能导致敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
denoland deno < 2.1.13 -

II. Public POCs for CVE-2025-48934

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III. Intelligence Information for CVE-2025-48934

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Patches & Fixes for CVE-2025-48934 (1)

Vendor Advisories for CVE-2025-48934 (1)

Same Patch Batch · denoland · 2025-06-04 · 3 CVEs total

CVE-2025-48888 Deno run with --allow-read and --deny-read flags results in allowed
CVE-2025-48935 Deno has --allow-read / --allow-write permission bypass in `node:sqlite`

IV. Related Vulnerabilities

Same product: deno
Same vendor: denoland
Same weakness: CWE-201

V. Comments for CVE-2025-48934

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