CVE-2026-22864: deno Command Injection

Vulnerability summary

CVE-2026-22864 is a critical (CVSS 9.8) Command Injection vulnerability in deno. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51.4% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 15-01-2026
   PublishedVulnerability first disclosed.
2. 16-01-2026
   Last modifiedVulnerability information updated.

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.

• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.