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CVE-2026-22864

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

Published: Jan 15, 2026Updated: Jan 21, 2026 Sources: CVE List NVD GHSACWE-77
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.6%
Top 55.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-77

Affected Products

denodeno
Library
OSS Libraries / generic-library
denodenoland
On-prem
OSS Libraries / generic-library
denocrates.ioOSS Libraries
denooss-projectOSS Librariesaka deno runtime, deno standard modules
denolandoss-projectUSOSS Librariesaka deno
crates.iopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/denoland/deno/releases/tag/v2.5.6
github.com
https://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-22864
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Jan 15, 2026
Last Updated
Jan 21, 2026

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