{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.0.0"
              },
              {
                "fixed": "2.0.1"
              }
            ],
            "source": "DESCRIPTION"
          },
          "events": [
            {
              "introduced": "62c8009df12bb5e6d63479e82b8335aaa8ba84c6"
            },
            {
              "fixed": "3824083e4632ecbdff50aa2e723e89fa42d9dcf6"
            }
          ],
          "repo": "https://github.com/chipsalliance/caliptra-sw",
          "type": "GIT"
        }
      ],
      "versions": [
        "2.1.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-456r-gcjr-6rxq"
  ],
  "database_specific": {
    "cna_assigner": "Caliptra",
    "cwe_ids": [
      "CWE-253"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5818.json"
  },
  "details": "Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update.\n\nThis issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.",
  "id": "CVE-2026-5818",
  "modified": "2026-07-15T01:49:17.272164539Z",
  "published": "2026-06-23T23:50:06.556Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5818.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5818"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chipsalliance/caliptra-sw"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MCU Firmware Update Authentication Bypass on Caliptra Core"
}