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EUVD-2026-275967

2026-10-06T10:23:10.445898+00:00

EUVD-2026-275967

fkie_cve-2026-32260

2026-10-06T10:23:10.445940+00:00

Deno is a JavaScript, TypeScript, and WebAssembly runtime. From 2.7.0 to 2.7.1, A command injection vulnerability exists in Deno's node:child_process polyfill (shell: true mode) that bypasses the fix for CVE-2026-27190. 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. Double quotes in POSIX sh do not suppress backtick command substitution, allowing injected commands to execute. An attacker who controls arguments passed to spawnSync or spawn with shell: true can execute arbitrary OS commands, bypassing Deno's permission system. This vulnerability is fixed in 2.7.2.

GHSA-4c96-w8v2-p28j — Deno vulnerable to command Injection via incomplete shell metacharacter blocklist in node:child_process

2026-10-06T10:23:10.445997+00:00

Affected: crates.io: deno

## 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:…