GHSA-xrx9-gj26-5wx9
HIGHGHSA-xrx9-gj26-5wx9 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in v8n. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-xrx9-gj26-5wx9 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
v8n vulnerable to Inefficient Regular Expression Complexity
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
v8nnpmDescription
Impact
Inefficient regular expression complexity of lowercase() and uppercase() regex could lead to a denial of service attack. With a formed payload 'a' + 'a'.repeat(i) + 'A', only 32 characters payload could take 29443 ms time execution when testing lowercase(). The same issue happens with uppercase().
Patches
v1.5.1
References
huntr.dev report Regular Expression Denial of Service (ReDoS) and Catastrophic Backtracking
For more information
If you have any questions or comments about this advisory:
- Open an issue in v8n issues list
- Email us at [email protected]
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | v8n | all versions | 1.5.1 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for v8n. 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 v8n to 1.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xrx9-gj26-5wx9 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-xrx9-gj26-5wx9 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-xrx9-gj26-5wx9. 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-xrx9-gj26-5wx9 in your dependencies?
O3 detects GHSA-xrx9-gj26-5wx9 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.