Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass

Summary 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...

CVE-2025-61787

creationtimestamp| type| source ---|---|--- 2025-10-09 03:11:17+00:00| seen| https://bsky.app/profile/infosec.skyfleet.blue/post/3m2q6nsgkwp2b...

CVE-2025-61787

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Versions prior to 2.5.3 and 2.2.15 are vulnerable to Command Line Injection attacks on Windows when batch files are executed. In Windows, CreateProcess always implicitly spawns cmd.exe if a batch file .bat, .cmd, etc. is being executed ev...

CVE-2025-61787

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Versions prior to 2.5.3 and 2.2.15 are vulnerable to Command Line Injection attacks on Windows when batch files are executed. In Windows, CreateProcess always implicitly spawns cmd.exe if a batch file .bat, .cmd, etc. is being executed ev...