{"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":"2026-06-24T13:04:40.166Z"},"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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-24T13:04:30.529915Z","id":"CVE-2026-5818","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-24T13:04:40.166Z"}}]}}