GHSA-4c96-w8v2-p28j

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Source
https://github.com/advisories/GHSA-4c96-w8v2-p28j
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4c96-w8v2-p28j/GHSA-4c96-w8v2-p28j.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-4c96-w8v2-p28j
Aliases
Published
2026-03-13T20:02:18Z
Modified
2026-03-14T09:26:22Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Deno vulnerable to command Injection via incomplete shell metacharacter blocklist in node:child_process
Details

Summary

A command injection vulnerability exists in Deno's node:child_process polyfill (shell: true mode) that bypasses the fix for CVE-2026-27190 (GHSA-hmh4-3xvx-q5hr). An attacker who controls arguments passed to spawnSync or spawn with shell: true can execute arbitrary OS commands, bypassing Deno's permission system.

Affected versions: Deno v2.7.0, v2.7.1

Details

The two-stage argument sanitization in transformDenoShellCommand (ext/node/polyfills/internal/child_process.ts) has a priority bug: when an argument contains a $VAR pattern, it is wrapped in double quotes (L1290) instead of single quotes (L1293). Double quotes in POSIX sh do not suppress backtick command substitution, allowing injected commands to execute.

Attack chain:

  1. escapeShellArg wraps the argument in single quotes (safe)
  2. op_node_parse_shell_args strips the single-quote delimiters during tokenization (raw argument exposed)
  3. Re-quoting detects $VAR pattern → applies double quotes
  4. Backtick payload inside double quotes executes via /bin/sh

Impact

OS Command Injection (CWE-78). Any application using node:child_process spawn/spawnSync with shell: true and user-controlled arguments is vulnerable. Injected commands execute at the OS process level, outside Deno's permission sandbox. Only --allow-run is required.

Mitigation

Avoid passing user-controlled input as arguments to spawn/spawnSync with shell: true. Use shell: false (the default) instead, or validate/sanitize inputs before passing them.

Database specific 
{
    "cwe_ids": [
        "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-13T20:02:18Z",
    "nvd_published_at": "2026-03-12T20:16:06Z",
    "severity": "HIGH"
}
References

Affected packages

crates.io / deno

Package

Name
deno
View open source insights on deps.dev
Purl
pkg:cargo/deno

Affected ranges

Type
SEMVER
Events
Introduced
2.7.0
Fixed
2.7.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4c96-w8v2-p28j/GHSA-4c96-w8v2-p28j.json"