Windows
CVE-2026-22864
HIGH
GHSA-m3c4-prhw-mrx6
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Arbitrary code execution in Deno runtime versions before 2.5.6 allows unauthenticated attackers to bypass shell script execution restrictions by using alternate casing in batch file extensions (e.g., .BAT, .Bat instead of .bat). The case-sensitive validation flaw enables attackers to spawn blocked Windows batch and command files, achieving remote code execution. Public exploit code exists and no patch is currently available for affected systems.
Technical ContextAI
Classified as CWE-77 (Command Injection). Affects Deno. 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.
RemediationAI
Fixed in version 2.5.6.. Restrict network access to the affected service where possible.
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Same weakness CWE-77 – Command Injection
View allVendor StatusVendor
SUSE
Severity: HighShare
External POC / Exploit Code
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