GHSA-378V-28HJ-76WF

Vulnerability from github – Published: 2026-02-20 06:30 – Updated: 2026-02-24 14:45
VLAI
Summary
bn.js affected by an infinite loop
Details

This affects versions of the package bn.js before 4.12.3 and 5.2.3. Calling maskn(0) on any BN instance corrupts the internal state, causing toString(), divmod(), and other methods to enter an infinite loop, hanging the process indefinitely.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "bn.js"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.12.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "bn.js"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2739"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-20T21:18:31Z",
    "nvd_published_at": "2026-02-20T05:17:53Z",
    "severity": "MODERATE"
  },
  "details": "This affects versions of the package bn.js before 4.12.3 and 5.2.3. Calling maskn(0) on any BN instance corrupts the internal state, causing toString(), divmod(), and other methods to enter an infinite loop, hanging the process indefinitely.",
  "id": "GHSA-378v-28hj-76wf",
  "modified": "2026-02-24T14:45:53Z",
  "published": "2026-02-20T06:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2739"
    },
    {
      "type": "WEB",
      "url": "https://github.com/indutny/bn.js/issues/186"
    },
    {
      "type": "WEB",
      "url": "https://github.com/indutny/bn.js/issues/316"
    },
    {
      "type": "WEB",
      "url": "https://github.com/indutny/bn.js/issues/316#issuecomment-3924217358"
    },
    {
      "type": "WEB",
      "url": "https://github.com/indutny/bn.js/pull/317"
    },
    {
      "type": "WEB",
      "url": "https://github.com/indutny/bn.js/commit/33df26b5771e824f303a79ec6407409376baa64b"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/Kr0emer/02370d18328c28b5dd7f9ac880d22a91"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/indutny/bn.js"
    },
    {
      "type": "WEB",
      "url": "https://github.com/indutny/bn.js/releases/tag/v5.2.3"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-BNJS-15274301"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "bn.js affected by an infinite loop"
}


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