Inefficient Regular Expression Complexity in fb55/nth-check
Priority LOW 37CWE-1333Published · Updated
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
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-1333.
Summary
nth-check is vulnerable to Inefficient Regular Expression Complexity
Why it matters now
EPSS 0.02206 82nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial fb55/nth-check (fb55): 2.0.1nth-check (npm): 2.0.1Red Hat: 5 without a fix
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 |
|---|---|---|---|---|---|
| fb55 | fb55/nth-check | before 2.0.1 | 2.0.1 | Patch available | CNA |
| — | nth-check (npm) | before 2.0.1 | 2.0.1 | Patch available | GHSA-rp65-9cf3-cjxr |
- fb55/nth-check Vendorfb55 Affected before 2.0.1 Fixed in 2.0.1 Patch available CNA
- nth-check (npm) Vendor— Affected before 2.0.1 Fixed in 2.0.1 Patch available GHSA-rp65-9cf3-cjxr
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nth-check_project:nth-check:*:*:*:*:*:*:*:* | before 2.0.1 | Vulnerable | Nth-check Project |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:nth-check_project:nth-check:*:*:*:*:*:*:*:* Versions before 2.0.1 Vulnerable ·Nth-check Project
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
- Fix · CNA fb55/nth-check (fb55) Fixed in 2.0.1
- Fix · GHSA-rp65-9cf3-cjxr nth-check (npm) Fixed in 2.0.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Service Mesh 1 | Affected | No fix planned: Out of support scope |
| OpenShift Service Mesh 2.0 | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix planned: Will not fix |
| Red Hat Virtualization 4 | Affected | No fix planned: Will not fix |
Not affected: 1 product
- Red Hat Advanced Cluster Management for Kubernetes 2
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3803
- 2026-10-03 Alias added: GHSA-rp65-9cf3-cjxr
References
Advisory 2
Sources
- CVE-2021-3803 · CVE Program
- CVE-2021-3803 · NVD
- FIRST EPSS
- GHSA-rp65-9cf3-cjxr · GitHub Advisory Database · CC BY 4.0
- CVE-2021-3803 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences