CVE-2026-32260 — deno
HIGHCVE-2026-32260 is a high-severity (CVSS 8.1) OS Command Injection vulnerability in deno. A fix is available for deno — see the affected versions and patch details below.
Command Injection via incomplete shell metacharacter blocklist in node:child_process (bypass of CVE-2026-27190 fix)
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-32260.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
denoReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
Description
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:
escapeShellArgwraps the argument in single quotes (safe)op_node_parse_shell_argsstrips the single-quote delimiters during tokenization (raw argument exposed)- Re-quoting detects
$VARpattern → applies double quotes - 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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | deno | ≥ 2.7.0&&< 2.7.2 | 2.7.2cargo update -p deno --precise 2.7.2 |
Affected Products
denodenoDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for deno, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update deno to 2.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-32260 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is CVE-2026-32260 in your dependencies?
Find it across crates.io, including transitive dependencies.