CVE-2026-22864

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.8 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H                                    

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.

Vulnerability Details

Published Date

January 15, 2026

Last Modified

January 21, 2026

CWE ID

CWE-77

Source

NVD

Vendor

deno

Product

deno

External References

https://github.com/denoland/deno/releases/tag/v2.5.6
https://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6

CVE-2026-22864

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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