CVE-2021-35065 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in glob-parent. 2 public exploit references exist, so weaponization risk is real. A fix is available for glob-parent — see the affected versions and patch details below.
glob-parent 6.0.0 vulnerable to Regular Expression Denial of Service
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.
Exploitation and automatability from CISA’s SSVC triage for CVE-2021-35065.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2021-35065 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
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.
glob-parentnpmDescription
glob-parent 6.0.0 is vulnerable to Regular Expression Denial of Service (ReDoS). This issue is fixed in version 6.0.1.
This vulnerability is separate from GHSA-ww39-953v-wcq6.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | glob-parent | ≥ 6.0.0&&< 6.0.1 | 6.0.1npm install glob-parent@6.0.1 |
Research 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 glob-parent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update glob-parent to 6.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-35065 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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2021-35065 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2021-35065. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
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.
The glob-parent package is a transitive dependency and this is not used directly in any of the Red Hat products. Hence, the impact is reduced to Moderate.
| Product | Fixed in | Advisory |
|---|---|---|
| MTA-6.0-RHEL-8 | mta/mta-ui-rhel8:6.0.1-10 | RHSA-2023:0934 |
| Red Hat Enterprise Linux 8 | nodejs:16-8070020230314140722.bd1311ed | RHSA-2023:1582 |
| Red Hat Enterprise Linux 8 | nodejs:18-8070020230322080930.bd1311ed | RHSA-2023:1583 |
| Red Hat Enterprise Linux 8 | nodejs:14-8070020230306170042.bd1311ed | RHSA-2023:1743 |
| Red Hat Enterprise Linux 8.4 Extended Update Support | nodejs:14-8040020230306170312.522a0ee4 | RHSA-2023:1533 |
| Red Hat Enterprise Linux 8.6 Extended Update Support | nodejs:14-8060020230306170237.ad008a3a | RHSA-2023:1742 |
| Red Hat Enterprise Linux 9 | nodejs:18-9020020230327152102.rhel9 | RHSA-2023:2654 |
| Red Hat Enterprise Linux 9 | nodejs-1:16.19.1-1.el9_2 | RHSA-2023:2655 |
Frequently Asked Questions
Is CVE-2021-35065 in your dependencies?
O3 Security finds CVE-2021-35065 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.