Deno
CVE-2026-22864
HIGH
GHSA-m3c4-prhw-mrx6
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCraft script with alternate-cased batch extension
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ExploitInvoke Deno spawn function
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ExecutionBypass case-sensitive extension filter
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ImpactExecute arbitrary Windows batch commands
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Command injection prevention
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Deno versions before 2.5.6 with child_process spawn capability enabled. Attacker must control script content passed to Deno's spawn() function with .BAT, .Bat, .bAt, or other mixed-case variants of batch file extensions on Windows systems. |
| Impact | CVSS 8.1 (HIGH). Attack vector: Network. Complexity: High. Privileges required: None. User interaction: None. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Arbitrary code execution in Deno runtime versions before 2.5.6 allows unauthenticated attackers to bypass shell script execution restrictions by using alternate casing in batch file extensions (e.g., .BAT, .Bat instead of .bat). The case-sensitive validation flaw enables attackers to spawn blocked Windows batch and command files, achieving remote code execution. Public exploit code exists and no patch is currently available for affected systems.
Earlier versions of this analysis (1)
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. [CVSS 8.1 HIGH]
RemediationAI
Fixed in version 2.5.6.. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in cargo
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-77 (Command Injection). Affects Deno. 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.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
Executive ViewAI
Organizations using Deno face notable risk from CVE-2026-22864, a command injection vulnerability rated CVSS 8.1. Successful exploitation could allow attackers to execute arbitrary code or commands on affected systems, potentially leading to full system compromise. Proof-of-concept code is publicly available, increasing the risk of exploitation. Organizations should apply vendor updates when available and consider compensating controls in the interim.
Apply vendor patch. If immediate patching is not feasible: (1) Deploy WAF rules to block injection patterns; (2) Restrict network access to affected components; (3) Enable enhanced logging for suspicious activity.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Affected Products (CPE)GitHub Advisory
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Deno versions 2.2.0 through 2.2.4 contain an authorization bypass vulnerability in SQLite database handling that allows
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Rated high severity (CVSS 8.8), this vulnerability is low att
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Rated high severity (CVSS 8.8), this vulnerability is low att
Deno is a simple, modern and secure runtime for JavaScript and TypeScript that uses V8 and is built in Rust. Rated high
Command injection on Windows in the Deno JavaScript/TypeScript runtime (versions prior to 2.5.3 and 2.2.15) allows attac
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Rated high severity (CVSS 8.3), this vulnerability is remotel
Command injection in Deno versions prior to 2.6.8 allows unauthenticated remote attackers to execute arbitrary commands
Deno versions up to 2.6.0 contains a vulnerability that allows attackers to have infinite encryptions (CVSS 7.5).
Versions of the package deno before 1.31.0 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the upg
Deno is a runtime for JavaScript and TypeScript that uses V8 and is built in Rust. Rated high severity (CVSS 7.5), this
Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. Rated high severity (CVSS 7.4), this vul
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