EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
qs📦qs📦qs📦qs📦qs📦qs📦qs📦qs+1 moreReal-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
qs before 6.10.3 allows attackers to cause a Node process hang because an __ proto__ key can be used. In many typical web framework use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000. The fix was backported to qs 6.9.7, 6.8.3, 6.7.3, 6.6.1, 6.5.3, 6.4.1, 6.3.3, and 6.2.4.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | qs | ≥ 6.10.0&&< 6.10.3 | 6.10.3 |
| 📦npm | qs | ≥ 6.9.0&&< 6.9.7 | 6.9.7 |
| 📦npm | qs | ≥ 6.8.0&&< 6.8.3 | 6.8.3 |
| 📦npm | qs | ≥ 6.7.0&&< 6.7.3 | 6.7.3 |
| 📦npm | qs | ≥ 6.6.0&&< 6.6.1 | 6.6.1 |
| 📦npm | qs | ≥ 6.5.0&&< 6.5.3 | 6.5.3 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Frequently Asked Questions
Is GHSA-hrpp-h998-j3pp in your stack?
O3 detects GHSA-hrpp-h998-j3pp across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.