CVE-2026-22864

HIGH

8.1

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.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published1/15/2026

Last Modified1/21/2026

Sourcenvd

Honeypot Sightings0

Affected Products

deno:deno

Weaknesses (CWE)

CWE-77

References

https://github.com/denoland/deno/releases/tag/v2.5.6(security-advisories@github.com)

https://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6(security-advisories@github.com)

IOC Correlations

No correlations recorded

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