Windows
CVE-2026-22864
HIGH
GHSA-m3c4-prhw-mrx6
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
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub 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.
AnalysisAI
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Deno versions before 2.5.6 with child_process spawn capability enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.1 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Fixed in version 2.5.6.. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. …
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Vendor StatusVendor
SUSE
Severity: HighShare
External POC / Exploit Code
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