CVE-2021-39171 json
Unlimited transforms allowed for signed nodes
published 2021-08-27 5 y ago modified 2026-07-08 4 mo ago also GHSA-5379-r78w-42h2 , EUVD-2021-1569
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 71%
- public exploits
- 0
- none known
Summary
Passport-SAML is a SAML 2.0 authentication provider for Passport, the Node.js authentication library. Prior to version 3.1.0, a malicious SAML payload can require transforms that consume significant system resources to process, thereby resulting in reduced or denied service. This would be an effective way to perform a denial-of-service attack. This has been resolved in version 3.1.0. The resolution is to limit the number of allowable transforms to 2.
Patch / fix
- npm passport-saml 3.1.0
- passport-saml_project passport-saml 3.1.0
- github.com/node-saml/passport-saml@f1e00b6 commit
- github.com/node-saml/passport-saml#595 pull request
Exploit prediction
1.32% chance of exploitation in the next 30 days, higher than 71% 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 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 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 | passport-saml | <3.1.0 |
3.1.0 |
Affected products
- node-saml passport-saml
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
github.com
/node-saml/passport-saml/pull/595
web, patch, third-party-advisory
-
github.com
/node-saml/passport-saml/commit/f1e00b64c21a725f545e675cd810bbaa435a3972
web
-
github.com
/node-saml/passport-saml/security/advisories/GHSA-5379-r78w-42h2
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-39171
advisory
-
github.com
/node-saml/passport-saml
package
Sources
- CVE List CVE-2021-39171
- GitHub Advisory GHSA-5379-r78w-42h2
- NVD CVE-2021-39171
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