{"id":"CVE-2026-11836","state":"PUBLISHED","title":"Production Debug-Unlock Token Verification Missing Device Binding","description":"Insufficient verification of data authenticity in Caliptra Core ROM and Core Firmware (validate_debug_unlock_token()) in subsystem mode allows an attacker with access to the integrator's debug unlock signing service to unlock production debug on an unintended device by presenting a valid token issued for a different device sharing the same debug unlock key hash. The 384-bit challenge nonce continues to prevent replay of previously issued tokens. Practical impact is limited to loss of per-device scope enforcement within a set of devices that share the same unlock authority by design; it does not enable debug unlock on devices outside that set.\n\nThis issue affects Core ROM: 2.0.0 through 2.0.2, 2.1.0 through 2.1.1; Core Firmware: 2.0.0 through 2.0.1, 2.1.0.","publishedAt":"2026-08-04T00:02:34.093Z","updatedAt":"2026-08-04T21:25:29.941Z","severity":{"score":1.8,"label":"Low","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","source":"Caliptra"},"assigner":"Caliptra","products":["Caliptra Core ROM","Caliptra Core Firmware"],"affected":[{"vendor":"Caliptra","product":"Core ROM","packageName":"Core ROM","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.0.2","versionType":"semver"},{"version":"2.0.3","status":"unaffected","versionType":"semver"},{"version":"2.1.0","status":"affected","lessThanOrEqual":"2.1.1","versionType":"semver"},{"version":"2.1.2","status":"unaffected","versionType":"semver"}],"collectionURL":"https://github.com/chipsalliance/caliptra-sw","modules":["validate_debug_unlock_token()"]},{"vendor":"Caliptra","product":"Core Firmware","packageName":"Core Firmware","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.0.1","versionType":"semver"},{"version":"2.0.2","status":"unaffected","versionType":"semver"},{"version":"2.1.0","status":"affected","versionType":"semver"},{"version":"2.1.1","status":"unaffected","versionType":"semver"}],"collectionURL":"https://github.com/chipsalliance/caliptra-sw","modules":["validate_debug_unlock_token()"]}],"references":["https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376"],"weaknesses":["CWE-345"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11836.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11836","state":"PUBLISHED","datePublished":"2026-08-04T00:02:34.093Z","dateUpdated":"2026-08-04T21:25:29.941Z","assignerShortName":"Caliptra","assignerOrgId":"b01ddd03-5ef6-483b-b2c5-acba77f1a554","dateReserved":"2026-06-09T23:30:40.399Z"},"containers":{"cna":{"title":"Production Debug-Unlock Token Verification Missing Device Binding","descriptions":[{"lang":"en","value":"Insufficient verification of data authenticity in Caliptra Core ROM and Core Firmware (validate_debug_unlock_token()) in subsystem mode allows an attacker with access to the integrator's debug unlock signing service to unlock production debug on an unintended device by presenting a valid token issued for a different device sharing the same debug unlock key hash. The 384-bit challenge nonce continues to prevent replay of previously issued tokens. Practical impact is limited to loss of per-device scope enforcement within a set of devices that share the same unlock authority by design; it does not enable debug unlock on devices outside that set.\n\nThis issue affects Core ROM: 2.0.0 through 2.0.2, 2.1.0 through 2.1.1; Core Firmware: 2.0.0 through 2.0.1, 2.1.0."}],"affected":[{"vendor":"Caliptra","product":"Core ROM","packageName":"Core ROM","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.0.2","versionType":"semver"},{"version":"2.0.3","status":"unaffected","versionType":"semver"},{"version":"2.1.0","status":"affected","lessThanOrEqual":"2.1.1","versionType":"semver"},{"version":"2.1.2","status":"unaffected","versionType":"semver"}],"collectionURL":"https://github.com/chipsalliance/caliptra-sw","modules":["validate_debug_unlock_token()"]},{"vendor":"Caliptra","product":"Core Firmware","packageName":"Core Firmware","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.0.1","versionType":"semver"},{"version":"2.0.2","status":"unaffected","versionType":"semver"},{"version":"2.1.0","status":"affected","versionType":"semver"},{"version":"2.1.1","status":"unaffected","versionType":"semver"}],"collectionURL":"https://github.com/chipsalliance/caliptra-sw","modules":["validate_debug_unlock_token()"]}],"references":[{"url":"https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","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":"LOW","baseScore":1.8,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345 Insufficient Verification of Data Authenticity","type":"CWE"}]}],"providerMetadata":{"shortName":"Caliptra","orgId":"b01ddd03-5ef6-483b-b2c5-acba77f1a554","dateUpdated":"2026-08-04T21:25:29.941Z"},"datePublic":"2026-08-03T00:00:00.000Z","impacts":[{"capecId":"CAPEC-115","descriptions":[{"lang":"en","value":"CAPEC-115 Authentication Bypass"}]}],"tags":["x_open-source"],"credits":[{"lang":"en","value":"Alex Matrosov with Claude, Anthropic","type":"finder"}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-04T19:24:52.944825Z","id":"CVE-2026-11836","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-04T19:25:11.267Z"}}]}}}