GHSL-2020-312: Regular Expression Denial of Service (ReDoS) in useragent
Priority HIGH 77CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
Useragent is a user agent parser for Node.js. All versions as of time of publication contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no patches are available.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00518 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| 3rd-Eden | useragent | all versions | — | No fix listed | CNA |
| — | useragent (npm) | up to 2.3.0 | — | No fix listed | GHSA-mgfv-m47x-4wqp |
- useragent Vendor3rd-Eden Affected all versions Fixed in — No fix listed CNA
- useragent (npm) Vendor— Affected up to 2.3.0 Fixed in — No fix listed GHSA-mgfv-m47x-4wqp
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:useragent_project:useragent:*:*:*:*:*:node.js:*:* | all versions | Vulnerable | Useragent Project |
- cpe:2.3:a:useragent_project:useragent:*:*:*:*:*:node.js:*:* Versions all versions Vulnerable ·Useragent Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 2 products
- Logging Subsystem for Red Hat OpenShift
- Red Hat Quay 3
Timeline
- 2026-10-02 Threatist record created from CVE-2020-26311
- 2026-10-03 Alias added: GHSA-mgfv-m47x-4wqp
References
Advisory 2
More Useragent Project Useragent vulnerabilities
- TI-2017-11754 Uncontrolled resource consumption in HackerOne useragent node module CVSS 3.0HIGH 7.5
Sources
- CVE-2020-26311 · CVE Program
- CVE-2020-26311 · NVD
- FIRST EPSS
- GHSA-mgfv-m47x-4wqp · GitHub Advisory Database · CC BY 4.0
- CVE-2020-26311 · 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