CVE-2016-10555
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…
- 6.5MediumCVSS base score
- 4.7%Exploitation in 30 daysEPSS · top 8.1% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By hackerone
- 7 months later
· 7 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium6.5 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 4.7% · top 8.1% of all CVEs (9 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Affected products
HackerOne · jwt-simple node module
- affected <=0.3.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmjwt-simpleGHSA-vgrx-w6rg-8fqf (opens in a new tab)
References
4
- https://nodesecurity.io/advisories/87 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/hokaccha/node-jwt-simple/pull/14 (opens in a new tab)x_refsource_MISCx_transferred
- https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/ (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/hokaccha/node-jwt-simple/pull/16 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2018-0779 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-vgrx-w6rg-8fqf (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-10555)Record last updated .