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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
8.1HIGH
NVD MITRE
EPSS Score
0.6%
Top 53.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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

deno
oss-projectaka deno standard modules, deno runtime
denoLibrary
OSS Libraries / generic-library
denoland
oss-project·USaka deno
denoOn-prem
OSS Libraries / generic-library
crates.io
package-ecosystem
deno
OSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
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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 →

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