🛡️ CVE-2026-22864 — deno

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-77 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

Summary

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.).

POC

```javascript

const command = new Deno.Command('./test.BAT', {

args: ['&calc.exe'],

});

const child = command.spawn();

```

This causes calc.exe to be launched; see the attached screenshot for evidence.

Patched in CVE-2025-61787 — prevents execution of .bat and .cmd files:

![photo_2025-10-10 02 27 23](https://github.com/user-attachments/assets/43df25e2-e2e1-48aa-8060-cb0a22637f1f)

Bypass of the patched vulnerability:

![photo_2025-10-10 02 27 25](https://github.com/user-attachments/assets/2be1afb4-84a1-4883-8e18-6a174fdd3615)

Impact

The script launches calc.exe on Windows, demonstrating that passing user-controlled arguments to a spawned batch script can result in command-line injection.

Mitigation

Users should update to Deno v2.5.6 or newer.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-22864 is classified as CWE-77: Command Injection. User input is placed into a command that the system interprets, allowing extra commands to be appended to the intended one.

Affected software

CVE-2026-22864 is recorded against 1 package.

  • deno

Timeline and source

Published on 16 January 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)
github.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-77
Public Exploit ⚠️ Yes
Source OSV
Published 2026-01-16
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
deno — —

Similar Threats

Exploit Protection

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CVE-2026-22864 carries CVSS 8.0 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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