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CVE-2026-49402— Deno: Command Injection via spawnSync & spawn on Windows

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 2.7.10之前版本存在命令注入漏洞，该漏洞源于node:child_process实现的escapeShellArg()帮助函数在Windows平台上未正确对包含cmd.exe元字符的参数进行引号处理，且未中和%符号，导致攻击者可通过控制参数注入任意额外命令。

CVSS 8.1 · High EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
denoland deno < 2.7.10 affected
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I. Basic Information for CVE-2026-49402

Vulnerability Information
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Vulnerability Title
Deno: Command Injection via spawnSync & spawn on Windows
Source: CVE Program / CVE List V5
Vulnerability Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.10, Deno's node:child_process implementation provided an escapeShellArg() helper used when callers passed shell: true to spawn / spawnSync / exec and friends. On Windows, the helper failed to quote arguments that contained cmd.exe metacharacters and did not neutralize % (which cmd.exe expands even inside double-quoted strings). An attacker who controlled any portion of an argument passed to such a call could inject arbitrary additional commands into the spawned cmd.exe invocation. This vulnerability is fixed in 2.7.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Deno Land Deno 命令注入漏洞
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 2.7.10之前版本存在命令注入漏洞，该漏洞源于node:child_process实现的escapeShellArg()帮助函数在Windows平台上未正确对包含cmd.exe元字符的参数进行引号处理，且未中和%符号，导致攻击者可通过控制参数注入任意额外命令。
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 < 2.7.10 -

II. Public POCs for CVE-2026-49402

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III. Intelligence Information for CVE-2026-49402

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Vendor Advisories for CVE-2026-49402 (1)

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

CVE-2026-49440 7.4 HIGH Deno: Miller-Rabin Primality Test Allows Zero Rounds
CVE-2026-44726 7.4 HIGH Deno: TLS retry copies stale upgrade hook, risking plaintext traffic
CVE-2026-49401 7.3 HIGH Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
CVE-2026-49411 6.5 MEDIUM Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks
CVE-2026-49406 5.5 MEDIUM Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow
CVE-2026-49983 5.2 MEDIUM Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with on
CVE-2026-49860 5.2 MEDIUM Deno: WebSocket API sandbox bypass via missing post-DNS check
CVE-2026-49859 5.2 MEDIUM Deno: `fetch()` API sandbox bypass via missing DNS resolution check
CVE-2026-55517 4.3 MEDIUM Deno: Denial of service via non-ASCII bytes in WebSocket response headers

IV. Related Vulnerabilities

Same product: deno
Same vendor: denoland
Same weakness: CWE-78

V. Comments for CVE-2026-49402

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