Security advisory

{
  "id": "78f2c98744a0f927a43373a5afb1cee546b3db727a2ec652156d0fe05c412336",
  "url": "https://osv.dev/vulnerability/CVE-2016-10555",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-10555",
    "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.",
    "evidence": "osv:CVE-2016-10555",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2016-10555",
      "aliases": [
        "CVE-2016-10555",
        "GHSA-vgrx-w6rg-8fqf"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hokaccha/node-jwt-simple",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3977b63548f466c8f2bdf4d881e1ed957dc23589"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:jwt-simple_project:jwt-simple:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-10555.json"
          }
        }
      ],
      "modified": "2026-10-20T10:47:13.524361823Z",
      "provider": "osv",
      "references": [
        "https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/",
        "https://nodesecurity.io/advisories/87",
        "https://github.com/hokaccha/node-jwt-simple/pull/14",
        "https://github.com/hokaccha/node-jwt-simple/pull/16"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2016-10555",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 379354,
  "published_at": "2018-05-31T20:29:02.067+00:00"
}