Regular expression denial of service (ReDoS) in forms
Priority LOW 27CWE-400Published · 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
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
The package forms before 1.2.1, from 1.3.0 and before 1.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via email validation.
Why it matters now
EPSS 0.0165 76th percentileScored 2026-11-07
Fix Fixed forms: 1.2.1, 1.3.2forms (npm): 1.3.2
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 |
|---|---|---|---|---|---|
| — | forms | before 1.2.1; 1.3.0 and later; before 1.3.2 | 1.2.1, 1.3.2 | Patch available | CNA |
| — | forms (npm) | before 1.3.2 | 1.3.2 | Patch available | GHSA-c56f-grv3-gpfr |
- forms Vendor— Affected before 1.2.1; 1.3.0 and later; before 1.3.2 Fixed in 1.2.1, 1.3.2 Patch available CNA
- forms (npm) Vendor— Affected before 1.3.2 Fixed in 1.3.2 Patch available GHSA-c56f-grv3-gpfr
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:forms_project:forms:*:*:*:*:*:node.js:*:* | before 1.2.1; 1.3.0 to before 1.3.2 | Vulnerable | Forms Project |
- cpe:2.3:a:forms_project:forms:*:*:*:*:*:node.js:*:* Versions before 1.2.1; 1.3.0 to before 1.3.2 Vulnerable ·Forms Project
Remediation
- Fix · CNA forms Fixed in 1.2.1, 1.3.2
- Fix · GHSA-c56f-grv3-gpfr forms (npm) Fixed in 1.3.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-23388
- 2026-10-03 Alias added: GHSA-c56f-grv3-gpfr
References
More Forms Project Forms vulnerabilities
- TI-2017-11740 Cross-site scripting in HackerOne forms node module CVSS 3.0MEDIUM 6.1
Sources
- CVE-2021-23388 · CVE Program
- CVE-2021-23388 · NVD
- FIRST EPSS
- GHSA-c56f-grv3-gpfr · GitHub Advisory Database · CC BY 4.0
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