SummaryA command injection vulnerability (CWE-78) has been found to exist in the wrangler pages deploy command. The issue occurs because the --commit-hash parameter is passed directly to a shell command without proper validation or sanitization, allowing an attacker with control of --commit-hash to execute arbitrary commands on the system running Wrangler. Root causeThe commitHash variable, derived from user input via the --commit-hash CLI argument, is interpolated directly into a shell command using template literals (e.g., execSync(git show -s --format=%B ${commitHash})).

Shell metacharacters are interpreted by the shell, enabling command execution. ImpactThis vulnerability is generally hard to exploit, as it requires --commit-hash to be attacker controlled. The vulnerability primarily affects CI/CD environments where wrangler pages deploy is used in automated pipelines and the --commit-hash parameter is populated from external, potentially untrusted sources.

An attacker could exploit this to: Run any shell command. Exfiltrate environment variables. Compromise the CI runner to install backdoors or modify build artifacts. Credits Disclosed responsibly by kny4hacker. Mitigation Wrangler v4 users are requested to upgrade to Wrangler v4.59.1 or higher. Wrangler v3 users are requested to upgrade to Wrangler v3.114.17 or higher. Users on Wrangler v2 (EOL) should upgrade to a supported major version.