Regular expression denial of service (ReDoS) in browserslist
Priority LOW 29CWE-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 · Low
- Fix status
- Partial Red Hat: 1 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-1333.
Summary
The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.
Why it matters now
EPSS 0.02383 84th percentileScored 2026-11-07
Fix Partial browserslist: 4.16.5browserslist (npm): 4.16.5Red Hat: 1 advisoryRed Hat: 1 fixed, 3 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 |
|---|---|---|---|---|---|
| — | browserslist | 4.0.0 and later; before 4.16.5 | 4.16.5 | Patch available | CNA |
| — | browserslist (npm) | 4.0.0 to before 4.16.5 | 4.16.5 | Patch available | GHSA-w8qv-6jwh-64r5 |
- browserslist Vendor— Affected 4.0.0 and later; before 4.16.5 Fixed in 4.16.5 Patch available CNA
- browserslist (npm) Vendor— Affected 4.0.0 to before 4.16.5 Fixed in 4.16.5 Patch available GHSA-w8qv-6jwh-64r5
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:browserslist_project:browserslist:*:*:*:*:*:node.js:*:* | 4.0.0 to before 4.16.5 | Vulnerable | Browserslist Project |
- cpe:2.3:a:browserslist_project:browserslist:*:*:*:*:*:node.js:*:* Versions 4.0.0 to before 4.16.5 Vulnerable ·Browserslist Project
Remediation
- Fix · CNA browserslist Fixed in 4.16.5
- Fix · GHSA-w8qv-6jwh-64r5 browserslist (npm) Fixed in 4.16.5 Advisory →
Red Hat 1 advisory
- RHSA-2021:3917 Released 2021-10-19 · Red Hat rating ImportantRed Hat Quay v3.6.0 security, bug fix and enhancement update
- Quay v3 quay/quay-rhel8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Service Mesh 2.0 | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Quay v3 | Fixed | RHSA-2021:3917 |
Not affected: 2 products
- Quay v3
- Red Hat Advanced Cluster Management for Kubernetes 2
Timeline
- 2026-10-02 Threatist record created from CVE-2021-23364
- 2026-10-03 Alias added: GHSA-w8qv-6jwh-64r5
References
Advisory 2
Sources
- CVE-2021-23364 · CVE Program
- CVE-2021-23364 · NVD
- FIRST EPSS
- GHSA-w8qv-6jwh-64r5 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-23364 · 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