GHSA-2W8X-224X-785M

Vulnerability from github – Published: 2026-03-17 06:31 – Updated: 2026-03-25 14:36
VLAI
Summary
sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey
Details

All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.8"
      },
      "package": {
        "ecosystem": "npm",
        "name": "sjcl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-4258"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-325",
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-18T16:10:06Z",
    "nvd_published_at": "2026-03-17T06:16:18Z",
    "severity": "HIGH"
  },
  "details": "All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim\u0027s ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.",
  "id": "GHSA-2w8x-224x-785m",
  "modified": "2026-03-25T14:36:28Z",
  "published": "2026-03-17T06:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4258"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bitwiseshiftleft/sjcl"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js#L454-L461"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey"
}


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