{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "8.0.18"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "6efc23aead22aa432613c345f84c39880f91744d"
            },
            {
              "fixed": "861ab2718b2bf8718830544c0e512cf127197316"
            },
            {
              "fixed": "6efc23aead22aa432613c345f84c39880f91744d"
            }
          ],
          "repo": "https://github.com/kjur/jsrsasign",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An issue was discovered in the jsrsasign package through 8.0.18 for Node.js. It allows a malleability in ECDSA signatures by not checking overflows in the length of a sequence and '0' characters appended or prepended to an integer. The modified signatures are verified as valid. This could have a security-relevant impact if an application relied on a single canonical signature.",
  "id": "CVE-2020-14966",
  "modified": "2026-04-01T23:10:23.873796926Z",
  "published": "2020-06-22T12:15:10.087Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/kjur/jsrsasign/releases/tag/8.0.17"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/kjur/jsrsasign/releases/tag/8.0.18"
    },
    {
      "type": "ADVISORY",
      "url": "https://kjur.github.io/jsrsasign/"
    },
    {
      "type": "ADVISORY",
      "url": "https://security.netapp.com/advisory/ntap-20200724-0001/"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.npmjs.com/package/jsrsasign"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/kjur/jsrsasign/issues/437"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}