What is CVE-2026-27190?

CVE-2026-27190 is a high-severity vulnerability in Deno, classified under OS Command Injection. CVSS score: 8.1/10. Published 2026-02-20.

How severe is CVE-2026-27190?

High severity. CVSS v3 base score is 8.1 out of 10.

RCE in Deno

CVE-2026-27190

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.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-02-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.032 (87.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.032 · change: +0.010

Affected products

Deno
Denoland Deno — versions < 2.6.8

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/denoland/deno/security/advisories/GHSA-hmh4-3xvx-q5hr (Exploit, Vendor Advisory)
github.com/denoland/deno/commit/9132ad958c83a0d0b199de12b69b877f63edab4c (Patch)
github.com/denoland/deno/releases/tag/v2.6.8 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-27190?: CVE-2026-27190 is a high-severity vulnerability in Deno, classified under OS Command Injection. CVSS score: 8.1/10. Published 2026-02-20.
How severe is CVE-2026-27190?: High severity. CVSS v3 base score is 8.1 out of 10.