GHSA-6956-83fg-5wc5 is a critical-severity (CVSS 9.8) CWE-1321 vulnerability in set-in. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for set-in — see the affected versions and patch details below.
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.
set-innpmDescription
The package set-in before 2.0.3 is vulnerable to Prototype Pollution via the setIn method, as it allows an attacker to merge object prototypes into it. Note: This vulnerability derives from an incomplete fix of CVE-2020-28273
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | set-in | all versions | 2.0.3npm install set-in@2.0.3 |
Affected Products
set-inset-in_projectResearch 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 set-in, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update set-in to 2.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6956-83fg-5wc5 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-6956-83fg-5wc5 in your dependencies?
Find it across npm, including transitive dependencies.