CVE-2026-5818

{
  "id": "CVE-2026-5818",
  "sourceIdentifier": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
  "published": "2026-06-24T00:16:33.830",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Comprobación incorrecta del valor de retorno de la función en el firmware de tiempo de ejecución de Caliptra Core (módulos ActivateFirmwareCmd::activate_fw) permite eludir la verificación de Caliptra Core del FW de la MCU durante una actualización sin interrupciones.\n\nEste problema afecta al firmware de tiempo de ejecución de Core: desde 2.0.0 hasta 2.0.1, 2.1.0."
    }
  ],
  "affected": [
    {
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
      "affectedData": [
        {
          "vendor": "Caliptra",
          "product": "Core Runtime Firmware",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/chipsalliance/caliptra-sw",
          "packageName": "Core Runtime Firmware",
          "modules": [
            "ActivateFirmwareCmd::activate_fw"
          ],
          "versions": [
            {
              "version": "2.0.0",
              "lessThanOrEqual": "2.0.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.1.0",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.0.2",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "2.1.1",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 7.2,
          "baseSeverity": "HIGH",
          "attackVector": "ADJACENT",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "subAvailabilityImpact": "HIGH",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-24T13:04:30.529915Z",
          "id": "CVE-2026-5818",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-253"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq",
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554"
    }
  ]
}