{
  "affected": [
    {
      "database_specific": {
        "unresolved_ranges": [
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2023-02-02"
              }
            ]
          }
        ]
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a6dcafe6ded8e61658b40f5699878cd19a481f80"
            }
          ],
          "repo": "https://github.com/facebook/hermes",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a6dcafe6ded8e61658b40f5699878cd19a481f80"
            }
          ],
          "repo": "https://github.com/facebook/hermes",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An error in BigInt conversion to Number in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by a malicious attacker to execute arbitrary code due to an out-of-bound write. Note that this bug is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.",
  "id": "CVE-2023-23556",
  "modified": "2026-03-13T21:47:39.150773168Z",
  "published": "2023-05-18T22:15:09.487Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80"
    },
    {
      "type": "FIX",
      "url": "https://www.facebook.com/security/advisories/cve-2023-23556"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}