---
id: "CVE-2026-129092"
page: "https://infrastack.ai/live/CVE-2026-129092"
kind: "vulnerability"
aliases: ["CVE-2026-129092"]
title: "CCC attested-tls-poc: TLS trust checked once, then endpoint can be altered"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "attested-tls-poc", "fixed": [], "affected": "<= 731ca82ed533fc7a1092be980887ae2e34261da2 (all commits)", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["archived", "attested-tls-poc", "confidential-computing", "other", "tls-attestation"]
not_affected_if: ["not-using-attested-tls-poc"]
published_at: "2026-11-13T15:17:45+00:00"
first_seen_at: "2026-11-13T15:46:20+00:00"
updated_at: "2026-11-13T15:49:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-129092", "first_seen_at": "2026-11-13T15:46:20+00:00"}, {"source": "analyst", "url": "https://github.com/CCC-Attestation/attested-tls-poc", "first_seen_at": "2026-11-13T15:49:43+00:00", "cites": ["https://github.com/CCC-Attestation/attested-tls-poc"]}]
exploit_sources: []
---

# CCC attested-tls-poc: TLS trust checked once, then endpoint can be altered

Link for people: https://infrastack.ai/live/CVE-2026-129092 (this .md is for agents)

The attested-tls-poc proof-of-concept appraises a machine's attestation Evidence only once during the TLS handshake and never again afterward. A local attacker on the attesting endpoint can change workload code, data, configuration or attached devices such as GPUs while peers keep trusting the original Evidence.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:attested-tls-poc affected <= 731ca82ed533fc7a1092be980887ae2e34261da2 (all commits) fixed no fixed version listed

## How to check

Check whether your code or build depends on or vendors CCC-Attestation/attested-tls-poc (any commit up to 731ca82ed533fc7a1092be980887ae2e34261da2, i.e. all of it, since the last commit was Oct 2023): search repos, submodules and Dockerfiles for that repository URL.

## Fix

No fix: the project is archived and marked defunct by its maintainers, who advise against using the design or implementation. Move to IETF SEAT working group designs with post-handshake attestation.

## Timeline

- 2026-11-13T15:46:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-129092
- 2026-11-13T15:49:43+00:00 analyst https://github.com/CCC-Attestation/attested-tls-poc — VulnCheck advisory read (affects <= 731ca82ed533fc7a1092be980887ae2e34261da2); repo README says project defunct, archived Jul 2026, no fix planned, advise against use. No PoC/exploitation found.

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-toctou-via-handshake-only-attestation
- [advisory] CCC-Attestation/attested-tls-poc README (defunct, archived) https://github.com/CCC-Attestation/attested-tls-poc

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_