CVE-2026-22864

Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass

Published 15 Jan 2026Modified 17 Jun 2026CWE 77

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

GHSA8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Julia9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, Julia. Rated lower by GHSA (high).

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.

Affected packages and fixed versions

Source	Package	Fixed in
julia::Julia Ecosystem Security Advisories	Deno_jll	2.6.3+0
cargo::GitHub Security Advisory Rust	deno	2.5.6

References

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