CVE-2024-23339 is a medium-severity (CVSS 6.3) CWE-1321 vulnerability in hoolock. A fix is available for hoolock — see the affected versions and patch details below.
Prototype pollution not blocked by object-path related utilities in hoolock
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-23339.
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.
hoolocknpmDescription
hoolock is a suite of lightweight utilities designed to maintain a small footprint when bundled. Starting in version 2.0.0 and prior to version 2.2.1, utility functions related to object paths (get, set, and update) did not block attempts to access or alter object prototypes. Starting in version 2.2.1, the get, set and update functions throw a TypeError when a user attempts to access or alter inherited properties.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | hoolock | ≥ 2.0.0&&< 2.2.1 | 2.2.1npm install hoolock@2.2.1 |
Affected Products
hoolockelijahharryDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hoolock, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update hoolock to 2.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-23339 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 CVE-2024-23339 in your dependencies?
Find it across npm, including transitive dependencies.