{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5818", "assignerOrgId": "b01ddd03-5ef6-483b-b2c5-acba77f1a554", "state": "PUBLISHED", "assignerShortName": "Caliptra", "dateReserved": "2026-04-08T15:45:10.928Z", "datePublished": "2026-06-23T23:50:06.556Z", "dateUpdated": "2026-06-23T23:50:06.556Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b01ddd03-5ef6-483b-b2c5-acba77f1a554", "shortName": "Caliptra", "dateUpdated": "2026-06-23T23:50:06.556Z"}, "title": "MCU Firmware Update Authentication Bypass on Caliptra Core", "datePublic": "2026-06-23T19:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-253", "description": "CWE-253 Incorrect check of function return value", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}], "affected": [{"vendor": "Caliptra", "product": "Core Runtime Firmware", "collectionURL": "https://github.com/chipsalliance/caliptra-sw", "packageName": "Core Runtime Firmware", "modules": ["ActivateFirmwareCmd::activate_fw"], "versions": [{"status": "affected", "version": "2.0.0", "lessThanOrEqual": "2.0.1", "versionType": "semver"}, {"status": "affected", "version": "2.1.0", "versionType": "semver"}, {"status": "unaffected", "version": "2.0.2", "versionType": "semver"}, {"status": "unaffected", "version": "2.1.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "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.", "supportingMedia": [{"type": "text/html", "base64": false, "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.<p>This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.</p>"}]}], "tags": ["x_open-source"], "references": [{"url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.2, "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"}}], "credits": [{"lang": "en", "value": "NVIDIA Offensive Security Research (OSR) team", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}}}

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