GHSA-W8Q8-93CX-6H7R

Vulnerability from github – Published: 2026-03-23 06:30 – Updated: 2026-03-29 15:51
VLAI
Summary
jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction
Details

Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.

Severity
8.7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
8.8 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "jsrsasign"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-4601"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-325"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-29T15:51:59Z",
    "nvd_published_at": "2026-03-23T06:16:21Z",
    "severity": "HIGH"
  },
  "details": "Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.",
  "id": "GHSA-w8q8-93cx-6h7r",
  "modified": "2026-03-29T15:51:59Z",
  "published": "2026-03-23T06:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4601"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kjur/jsrsasign/pull/645"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kjur/jsrsasign"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction"
}


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