Unlimited requests in modern-async
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
modern-async is an open source JavaScript tooling library for asynchronous operations using async/await and promises. In affected versions a bug affecting two of the functions in this library: forEachSeries and forEachLimit. They should limit the concurrency of some actions but, in practice, they don't. Any code calling these functions will be written thinking they would limit the concurrency but they won't. This could lead to potential security issues in other projects. The problem has been patched in 1.0.4. There is no workaround.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| nicolas-van | modern-async | before 1.0.4 | 1.0.4 | Patch available | CNA |
| — | modern-async (npm) | before 1.0.4 | 1.0.4 | Patch available | GHSA-3pcq-34w5-p4g2 |
- modern-async Vendornicolas-van Affected before 1.0.4 Fixed in 1.0.4 Patch available CNA
- modern-async (npm) Vendor— Affected before 1.0.4 Fixed in 1.0.4 Patch available GHSA-3pcq-34w5-p4g2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:modern-async_project:modern-async:*:*:*:*:*:node.js:*:* | before 1.0.4 | Vulnerable | Modern-async Project |
- cpe:2.3:a:modern-async_project:modern-async:*:*:*:*:*:node.js:*:* Versions before 1.0.4 Vulnerable ·Modern-async Project
Remediation
- Fix · CNA modern-async (nicolas-van) Fixed in 1.0.4
- Fix · GHSA-3pcq-34w5-p4g2 modern-async (npm) Fixed in 1.0.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41167
- 2026-10-03 Alias added: GHSA-3pcq-34w5-p4g2
References
Advisory 2
Sources
- CVE-2021-41167 · CVE Program
- CVE-2021-41167 · NVD
- FIRST EPSS
- GHSA-3pcq-34w5-p4g2 · GitHub Advisory Database · CC BY 4.0
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