GHSA-hhq3-ff78-jv3g
HIGHGHSA-hhq3-ff78-jv3g is a high-severity (CVSS 7.5) CWE-1333 vulnerability in loader-utils. O3 Security confirms whether GHSA-hhq3-ff78-jv3g is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
loader-utils is vulnerable to Regular Expression Denial of Service (ReDoS)
Blast Radius
loader-utils📦loader-utils📦loader-utilsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
A regular expression denial of service (ReDoS) flaw was found in Function interpolateName in interpolateName.js in webpack loader-utils via the resourcePath variable in interpolateName.js. A badly or maliciously formed string could be used to send crafted requests that cause a system to crash or take a disproportional amount of time to process. This issue has been patched in versions 1.4.2, 2.0.4 and 3.2.1.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | loader-utils | ≥ 1.0.0&&< 1.4.2 | 1.4.2 |
| 📦npm | loader-utils | ≥ 2.0.0&&< 2.0.4 | 2.0.4 |
| 📦npm | loader-utils | ≥ 3.0.0&&< 3.2.1 | 3.2.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for loader-utils. 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 loader-utils to 1.4.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hhq3-ff78-jv3g 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-hhq3-ff78-jv3g 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-hhq3-ff78-jv3g. 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-hhq3-ff78-jv3g in your dependencies?
O3 detects GHSA-hhq3-ff78-jv3g across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.