Vulnerability in Deno Runtime Affecting File Execution
CVE-2026-22864

8.1HIGH

Key Information:

Vendor

Denoland

Status
Deno
Vendor
CVE Published:
15 January 2026

What is CVE-2026-22864?

Deno, a runtime for JavaScript, TypeScript, and WebAssembly, contains a vulnerability that allows for improper validation of file extensions when spawning processes. Prior to version 2.5.6, the implementation utilized a case-sensitive check against specific file extensions such as .bat and .cmd. This check could be bypassed by using alternate casing (like .BAT or .Bat), potentially enabling the execution of unauthorized batch scripts and compromising system security. The vulnerability has been addressed in version 2.5.6, which reinforces checks to better secure the execution environment.

Affected Version(s)

deno < 2.5.6

References

https://github.com/denoland/deno/security/advisories/GHSA...
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https://github.com/denoland/deno/releases/tag/v2.5.6
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CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.