Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-49983— Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access

CVSS 5.2 · Medium EPSS 0.10% · P1

Affected Version Matrix 1

VendorProductVersion RangeStatus
denolanddeno< 2.8.1affected
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-49983

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access
Source: CVE Program / CVE List V5
Vulnerability Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, environment access is gated by the env permission. You can deny it with --deny-env, or restrict it to a specific allowlist with --allow-env=FOO,BAR. The expectation is that a program running without env permission cannot change process.env. process.loadEnvFile() (the Node-compatible API for loading variables from a .env file) does not honor this. It only checks that the program has read permission for the dotenv file, then writes every key in that file into the process environment — even when env access is denied. In effect, --allow-read plus a writable or attacker-controlled .env file is enough to defeat --deny-env. This vulnerability is fixed in 2.8.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Deno Land Deno 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deno是Deno组织开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno Land Deno 2.8.1之前版本存在授权问题漏洞，该漏洞源于env权限授权不正确，process.loadEnvFile()未尊重env权限设置，可能允许具有读取dotenv文件权限的程序将文件中的密钥写入进程环境，从而绕过--deny-env限制。
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

VendorProductAffected VersionsCPESubscribe
denolanddeno < 2.8.1 -

II. Public POCs for CVE-2026-49983

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-49983

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-49983 (1)

Same Patch Batch · denoland · 2026-06-23 · 10 CVEs total

CVE-2026-494028.1 HIGHDeno: Command Injection via spawnSync & spawn on Windows
CVE-2026-494407.4 HIGHDeno: Miller-Rabin Primality Test Allows Zero Rounds
CVE-2026-447267.4 HIGHDeno: TLS retry copies stale upgrade hook, risking plaintext traffic
CVE-2026-494017.3 HIGHDeno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
CVE-2026-494116.5 MEDIUMDeno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks
CVE-2026-494065.5 MEDIUMDeno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow
CVE-2026-498605.2 MEDIUMDeno: WebSocket API sandbox bypass via missing post-DNS check
CVE-2026-498595.2 MEDIUMDeno: `fetch()` API sandbox bypass via missing DNS resolution check
CVE-2026-555174.3 MEDIUMDeno: Denial of service via non-ASCII bytes in WebSocket response headers

IV. Related Vulnerabilities

Same product: deno
Same vendor: denoland
Same weakness: CWE-863

V. Comments for CVE-2026-49983

No comments yet

Leave a comment