CVE-2021-23388 json
Regular Expression Denial of Service (ReDoS)
published 2021-05-31 5 y ago modified 2026-07-08 4 mo ago also GHSA-c56f-grv3-gpfr , EUVD-2021-1307
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 76%
- public exploits
- 0
- none known
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.
Patch / fix
- npm forms 1.3.2
- n/a forms 1.2.1, 1.3.2
- github.com/caolan/forms#214 commit
- github.com/caolan/forms#214 pull request
- snyk.io/vuln/SNYK-JS-FORMS-1296389 advisory
Exploit prediction
1.65% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | forms | <1.3.2 |
1.3.2 |
Affected products
- n/a forms
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
github.com
/caolan/forms/pull/214
web, third-party-advisory
-
github.com
/caolan/forms/pull/214/commits/d4bd5b5febfe49c1f585f162e04ec810f8dc47a0
web, patch, third-party-advisory
-
snyk.io
/vuln/SNYK-JS-FORMS-1296389
web, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-23388
advisory
Sources
- CVE List CVE-2021-23388
- GitHub Advisory GHSA-c56f-grv3-gpfr
- NVD CVE-2021-23388
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.