CVE-2026-27190 Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process
Attackers can execute arbitrary commands via incomplete shell metacharacter filtering in Deno's node:child_process module.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27190?
CVE-2026-27190 is a high-severity command injection vulnerability in denoland deno, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.6.8, a command injection vulnerability exists in Deno's node:child_process implementation. This vulnerability is fixed in 2.6.8.
Weakness: CWE-78
Which versions are affected by CVE-2026-27190?
2 open source packages ship an affected version, including deno. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
deno crates.io | All versions | 2.6.8 |
deno crates.io | All versions | 2.6.8 |
Products include Deno Deno.
How do I fix CVE-2026-27190?
Upgrade deno to 2.6.8 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-27190 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27190 exists.
Other vulnerabilities in denoland deno
- CVE-2023-28445 Deno improperly handles resizable ArrayBuffer
- CVE-2022-24783 Sandbox bypass leading to arbitrary code execution in Deno
- CVE-2021-32619 Static imports inside dynamically imported modules do not adhere to permission checks
- CVE-2026-22863 Deno node:crypto doesn't finalize cipher
- CVE-2024-27936 Deno interactive permission prompt spoofing via improper ANSI stripping
Sources
Also known as GHSA-hmh4-3xvx-q5hr, JLSEC-2026-116.