Mongoose Prototype Pollution vulnerabilityGHSA-9m93-w8w6-76hh
CRITICALFix: Automattic/mongoose@e29578dGHSA-9m93-w8w6-76hh is a critical-severity (CVSS 10) CWE-1321 vulnerability in mongoose. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for mongoose — see the affected versions and patch details below.
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for GHSA-9m93-w8w6-76hh.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
mongoosenpmDescription
Prototype Pollution in GitHub repository automattic/mongoose prior to 7.3.3, 6.11.3, and 5.13.20.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | mongoose | ≥ 7.0.0&&< 7.3.3 | 7.3.3npm install mongoose@7.3.3 |
| 📦npm | mongoose | ≥ 6.0.0&&< 6.11.3 | 6.11.3npm install mongoose@6.11.3 |
| 📦npm | mongoose | all versions | 5.13.20npm install mongoose@5.13.20 |
Affected Products
mongoosemongoosejsResearch 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 mongoose, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update mongoose to 7.3.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9m93-w8w6-76hh 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.
Frequently Asked Questions
Is GHSA-9m93-w8w6-76hh in your dependencies?
Find it across npm, including transitive dependencies.