CVE-2021-30483 is a medium-severity (CVSS 5.3) Path Traversal vulnerability in isomorphic-git. 1 public exploit reference exists, so weaponization risk is real. A fix is available for isomorphic-git — see the affected versions and patch details below.
Directory Traversal in isomorphic-git
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-30483 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
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.
isomorphic-gitnpmDescription
isomorphic-git before 1.8.2 allows Directory Traversal via a crafted repository.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | isomorphic-git | all versions | 1.8.2npm install isomorphic-git@1.8.2 |
Affected Products
isomorphic-gitisomorphic-gitResearch 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 isomorphic-git, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update isomorphic-git to 1.8.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-30483 is resolved across your whole dependency graph.
Workarounds
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
In Red Hat Virtualization, isomorphic-git is a build time dependency and is not delivered with the product. Therefore impact has been rated Low.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | vdsm-0:4.50.3.6-1.el8ev | RHSA-2023:0074 |
Frequently Asked Questions
Is CVE-2021-30483 in your dependencies?
Find it across npm, including transitive dependencies.