GHSA-p9fg-j6ww-953m
FOSRestBundle issue with broken validation of JSONP callbacks
Blast Radius
friendsofsymfony/rest-bundleReal-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
Starting with FOSRestBundle 1.2 we switched to using willdurand/jsonp-callback-validator for validation of JSONP callbacks. However the change was implemented incorrectly validating the callback query param name, rather than its value. Anyone using the JSONP handler (which is off by default) together with FOSRestBundle 1.2.0 or 1.2.1 should update to FOSRestBundle 1.2.2.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | friendsofsymfony/rest-bundle | ≥ 1.2.0&&< 1.2.2 | 1.2.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for friendsofsymfony/rest-bundle. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update friendsofsymfony/rest-bundle to 1.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-p9fg-j6ww-953m is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-p9fg-j6ww-953m is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-p9fg-j6ww-953m. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-p9fg-j6ww-953m in your dependencies?
O3 detects GHSA-p9fg-j6ww-953m across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.