CVE-2014-4931 is a high-severity (CVSS 7.5) vulnerability in symfony/framework-bundle. A fix is available for symfony/framework-bundle — see the affected versions and patch details below.
Code injection in the way Symfony implements translation caching in FrameworkBundle
Real-World Exposure
symfony/framework-bundle🐘symfony/framework-bundle🐘symfony/framework-bundle🐘symfony/symfony🐘symfony/symfony🐘symfony/symfonyReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
When investigating issue #11093, Jeremy Derussé found a serious code injection issue in the way Symfony implements translation caching in FrameworkBundle.
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Your Symfony application is vulnerable if you meet the following conditions:
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You are using the Symfony translation system from FrameworkBundle (so basically if you are using Symfony full-stack -- you are not affected if you are using the Translation component with Silex for instance); You don't sanitize locales coming from a URL (any route with a _locale argument for instance):
When vulnerable, an attacker can submit a non-valid locale value that can contain some PHP code that will be executed by Symfony. That's because the locale value is dumped into a PHP file generated in the cache without being sanitized first.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | symfony/framework-bundle | ≥ 2.0.0&&< 2.3.18 | 2.3.18composer require symfony/framework-bundle:^2.3.18 |
| 🐘Packagist | symfony/framework-bundle | ≥ 2.4.0&&< 2.4.8 | 2.4.8composer require symfony/framework-bundle:^2.4.8 |
| 🐘Packagist | symfony/framework-bundle | ≥ 2.5.0&&< 2.5.2 | 2.5.2composer require symfony/framework-bundle:^2.5.2 |
| 🐘Packagist | symfony/symfony | ≥ 2.0.0&&< 2.3.19 | 2.3.19composer require symfony/symfony:^2.3.19 |
| 🐘Packagist | symfony/symfony | ≥ 2.4.0&&< 2.4.9 | 2.4.9composer require symfony/symfony:^2.4.9 |
| 🐘Packagist | symfony/symfony | ≥ 2.5.0&&< 2.5.4 | 2.5.4composer require symfony/symfony:^2.5.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/framework-bundle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update symfony/framework-bundle to 2.3.18 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2014-4931 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-2014-4931 in your dependencies?
Find it across Packagist, including transitive dependencies.