CVE-2023-43646 is a high-severity (CVSS 8.6) Uncontrolled Resource Consumption vulnerability in get-func-name. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for get-func-name — see the affected versions and patch details below.
Inefficient Regular Expression Complexity in get-func-name
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.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-43646.
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.
get-func-namenpmDescription
get-func-name is a module to retrieve a function's name securely and consistently both in NodeJS and the browser. Versions prior to 2.0.1 are subject to a regular expression denial of service (redos) vulnerability which may lead to a denial of service when parsing malicious input. This vulnerability can be exploited when there is an imbalance in parentheses, which results in excessive backtracking and subsequently increases the CPU load and processing time significantly. This vulnerability can be triggered using the following input: '\t'.repeat(54773) + '\t/function/i'. This issue has been addressed in commit f934b228b which has been included in releases from 2.0.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | get-func-name | all versions | 2.0.1npm install get-func-name@2.0.1 |
Affected Products
get-func-namechaijsResearch 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 get-func-name, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update get-func-name to 2.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-43646 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
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.
- This vulnerability can be exploited when there is an imbalance in parentheses, which results in excessive backtracking and subsequently increases the CPU load and processing time significantly. This vulnerability can be triggered using the following input: '\t'.repeat(54773) + '\t/function/i' - The get-func-name…
| Product | Fixed in | Advisory |
|---|---|---|
| RHODF-4.15-RHEL-9 | odf4/odf-console-rhel9:v4.15.0-57 | RHSA-2024:1383 |
| RHODF-4.16-RHEL-9 | odf4/odf-multicluster-console-rhel9:v4.16.0-58 | RHSA-2024:4591 |
Frequently Asked Questions
Is CVE-2023-43646 in your dependencies?
Find it across npm, including transitive dependencies.