CVE-2024-36858 is a critical-severity (CVSS 9.8) Unrestricted File Upload vulnerability in @janhq/core. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Jan path traversal vulnerability
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.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-36858.
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.
@janhq/corenpmDescription
An arbitrary file upload vulnerability in the /v1/app/writeFileSync interface of Jan v0.4.12 allows attackers to execute arbitrary code via uploading a crafted file. @janhq/core has been deprecated in favor of janhq/jan, this vulnerability has been patched there in v0.5.2.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @janhq/core | all versions | No fix |
Affected Products
janhomebrewResearch 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 @janhq/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of @janhq/core for CVE-2024-36858. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.
How to detect CVE-2024-36858
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2024-36858 -u https://target- Template
- Jan v0.4.12 - Arbitrary File Upload
- Severity
- critical
- Impact
- Unauthenticated attackers can upload crafted files to execute arbitrary code on the server.
- Remediation
- Update Jan to a version later than v0.4.12 that patches the arbitrary file upload vulnerability.
Template by ProjectDiscovery nuclei-templates (pussycat0x), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2024-36858 in your dependencies?
Find it across npm, including transitive dependencies.