CVE-2026-22864

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.

PUBLISHED Reserved 2026-01-12 | Published 2026-01-15 | Updated 2026-01-16 | Assigner GitHub_M

Problem types

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')

Product status

References

github.com/...d/deno/security/advisories/GHSA-m3c4-prhw-mrx6

github.com/denoland/deno/releases/tag/v2.5.6

cve.org (CVE-2026-22864)

nvd.nist.gov (CVE-2026-22864)

Download JSON