CVE-2026-22864— Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass
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 2.5.6之前版本存在命令注入漏洞，该漏洞源于对扩展名执行区分大小写的比较，可能导致绕过路径检查。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-22864
Vulnerability Information
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Vulnerability Title
Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.5.6, a prior patch aimed to block spawning Windows batch/shell files by returning an error when a spawned path’s extension matched .bat or .cmd. That check performs a case-sensitive comparison against lowercase literals and therefore can be bypassed when the extension uses alternate casing (for example .BAT, .Bat, etc.). This vulnerability is fixed in 2.5.6.
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
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Deno 命令注入漏洞
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 2.5.6之前版本存在命令注入漏洞，该漏洞源于对扩展名执行区分大小写的比较，可能导致绕过路径检查。
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
II. Public POCs for CVE-2026-22864
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2026-22864 (1)
IV. Related Vulnerabilities
Same product: deno
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Deno: Command Injection via spawnSync & spawn on Windows
Same vendor: denoland
-
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Deno 2.7.0 through 2.9.7 Command Injection via node:child_pr -
CVE-2026-55517
Deno: Denial of service via non-ASCII bytes in WebSocket res -
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Deno: TLS retry copies stale upgrade hook, risking plaintext -
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Deno Permission Bypass via Unicode Normalization Mismatch on -
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Deno: Command Injection via spawnSync & spawn on Windows
Same weakness: CWE-77
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V. Comments for CVE-2026-22864
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