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.

Attack Vector Local

Attack Complexity High

Privileges Required High

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity High

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
CCC-Attestation attested-tls-poc unaffected
Version Status Constraints
0 affected ≤ 731ca82ed533fc7a1092be980887ae2e34261da2

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Ccc-attestation Subscribe
Attested-tls-poc Subscribe

Project Subscriptions

Vendors Products
Ccc-attestation Subscribe
Attested-tls-poc Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://doi.org/10.1145/3779208.3785387 cve-icon cve-icon
https://github.com/CCC-Attestation/attested-tls-poc cve-icon cve-icon
https://github.com/CCC-Attestation/formal-spec-id-crisis cve-icon cve-icon
https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436 cve-icon cve-icon
https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-toctou-via-handshake-only-attestation cve-icon cve-icon
History

Fri, 13 Nov 2026 22:30:00 +0000

Type Values Removed Values Added
First Time appeared Ccc-attestation
Ccc-attestation attested-tls-poc
Vendors & Products Ccc-attestation
Ccc-attestation attested-tls-poc

Fri, 13 Nov 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title CCC Attestation SIG attested-tls-poc through commit 731ca82 TOCTOU via Handshake-Only Attestation
Weaknesses CWE-367
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 7, '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'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-13T15:11:13.522Z

Reserved: 2026-11-13T15:08:47.490Z

Link: CVE-2026-129092

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-13T15:17:45.513

Modified: 2026-11-13T15:17:45.513

Link: CVE-2026-129092

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-13T22:15:21Z

Weaknesses