GHSA-vp56-6g26-6827
MEDIUMGHSA-vp56-6g26-6827 is a medium-severity (CVSS 5.9) CWE-1333 vulnerability in node-fetch. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-vp56-6g26-6827 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
node-fetch Inefficient Regular Expression Complexity
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
node-fetchnpmDescription
node-fetch is a light-weight module that brings window.fetch to node.js.
Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) in the isOriginPotentiallyTrustworthy() function in referrer.js, when processing a URL string with alternating letters and periods, such as 'http://' + 'a.a.'.repeat(i) + 'a'.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | node-fetch | ≥ 3.0.0&&< 3.2.10 | 3.2.10 |
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 node-fetch. 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 node-fetch to 3.2.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vp56-6g26-6827 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-vp56-6g26-6827 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-vp56-6g26-6827. 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-vp56-6g26-6827 in your dependencies?
O3 detects GHSA-vp56-6g26-6827 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.