Improper input validation in HackerOne jwt-simple node module
Priority LOW 37CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA's public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.
Why it matters now
EPSS 0.04823 92nd percentileScored 2026-11-07
Fix Fixed jwt-simple (npm): 0.3.1
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 |
|---|---|---|---|---|---|
| HackerOne | jwt-simple node module | up to 0.3.0 | — | No fix listed | CNA |
| — | jwt-simple (npm) | before 0.3.1 | 0.3.1 | Patch available | GHSA-vgrx-w6rg-8fqf |
- jwt-simple node module VendorHackerOne Affected up to 0.3.0 Fixed in — No fix listed CNA
- jwt-simple (npm) Vendor— Affected before 0.3.1 Fixed in 0.3.1 Patch available GHSA-vgrx-w6rg-8fqf
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:jwt-simple_project:jwt-simple:*:*:*:*:*:node.js:*:* | up to 0.3.0 | Vulnerable | Jwt-simple Project |
- cpe:2.3:a:jwt-simple_project:jwt-simple:*:*:*:*:*:node.js:*:* Versions up to 0.3.0 Vulnerable ·Jwt-simple Project
Remediation
- Fix · GHSA-vgrx-w6rg-8fqf jwt-simple (npm) Fixed in 0.3.1 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2016-10555
- 2026-10-03 Alias added: GHSA-vgrx-w6rg-8fqf
References
Advisory 5
Sources
- CVE-2016-10555 · CVE Program
- CVE-2016-10555 · NVD
- FIRST EPSS
- GHSA-vgrx-w6rg-8fqf · GitHub Advisory Database · CC BY 4.0
- CVE-2016-10555 · 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