{"id":"CVE-2026-129092","state":"PUBLISHED","title":"CCC Attestation SIG attested-tls-poc through commit 731ca82 TOCTOU via Handshake-Only Attestation","description":"CCC Attestation SIG attested-tls-poc through commit 731ca82 contains a time-of-check time-of-use vulnerability because Evidence is appraised only once during the TLS handshake, without post-handshake re-attestation. Attackers with local access to the attesting endpoint can alter workload code, data, configuration, or attached devices like GPUs while peers keep trusting the original Evidence.","publishedAt":"2026-11-13T15:11:13.522Z","updatedAt":"2026-11-13T15:11:13.522Z","severity":{"score":7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["CCC-Attestation attested-tls-poc"],"affected":[{"vendor":"CCC-Attestation","product":"attested-tls-poc","packageURL":"pkg:github/ccc-attestation/attested-tls-poc","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"731ca82ed533fc7a1092be980887ae2e34261da2","versionType":"git"}],"collectionURL":"https://github.com/CCC-Attestation/attested-tls-poc","repo":"https://github.com/CCC-Attestation/attested-tls-poc"}],"references":["https://doi.org/10.1145/3779208.3785387","https://github.com/CCC-Attestation/formal-spec-id-crisis","https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436","https://github.com/CCC-Attestation/attested-tls-poc","https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-toctou-via-handshake-only-attestation"],"weaknesses":["CWE-367"],"ingestedAt":"2026-11-13T15:20:06.832Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/129xxx/CVE-2026-129092.json","commit":"f6ec93cfa585fddfed3d236faedbc6f6ebd68a57","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-129092","state":"PUBLISHED","datePublished":"2026-11-13T15:11:13.522Z","dateUpdated":"2026-11-13T15:11:13.522Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-11-13T15:08:47.490Z"},"containers":{"cna":{"title":"CCC Attestation SIG attested-tls-poc through commit 731ca82 TOCTOU via Handshake-Only Attestation","descriptions":[{"lang":"en","value":"CCC Attestation SIG attested-tls-poc through commit 731ca82 contains a time-of-check time-of-use vulnerability because Evidence is appraised only once during the TLS handshake, without post-handshake re-attestation. Attackers with local access to the attesting endpoint can alter workload code, data, configuration, or attached devices like GPUs while peers keep trusting the original Evidence."}],"affected":[{"vendor":"CCC-Attestation","product":"attested-tls-poc","packageURL":"pkg:github/ccc-attestation/attested-tls-poc","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"731ca82ed533fc7a1092be980887ae2e34261da2","versionType":"git"}],"collectionURL":"https://github.com/CCC-Attestation/attested-tls-poc","repo":"https://github.com/CCC-Attestation/attested-tls-poc"}],"references":[{"url":"https://doi.org/10.1145/3779208.3785387","tags":["technical-description"]},{"url":"https://github.com/CCC-Attestation/formal-spec-id-crisis","tags":["technical-description"]},{"url":"https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436","tags":["technical-description"]},{"url":"https://github.com/CCC-Attestation/attested-tls-poc","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-toctou-via-handshake-only-attestation","name":"VulnCheck Advisory: CCC Attestation SIG attested-tls-poc through commit 731ca82 TOCTOU via Handshake-Only Attestation","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","attackVector":"LOCAL","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":5.7,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-367","lang":"en","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-11-13T15:11:13.522Z"},"datePublic":"2026-10-17T00:00:00.000Z","tags":["unsupported-when-assigned"],"credits":[{"lang":"en","value":"Muhammad Usama Sardar","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}