---
title: "CVE-2026-112377: CCC Attestation SIG attested-tls-poc - Authentication Bypass"
description: "CCC Attestation SIG attested-tls-poc contains a replay attack vulnerability caused by failure to bind early attestation Evidence to the TLS connection, letting attackers with extracted private keys impersonate workloads and intercept data, exploit requires attacker to hold attested TLS private key."
url: https://panop.io/threat-heartbeat/CVE-2026-112377/
---

# CVE-2026-112377 CCC Attestation SIG attested-tls-poc - Authentication Bypass

CCC Attestation SIG attested-tls-poc contains a replay attack vulnerability caused by failure to bind early attestation Evidence to the TLS connection, letting attackers with extracted private keys impersonate workloads and intercept data, exploit requires attacker to hold attested TLS private key.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-112377)

## Details

Type

Authentication Bypass

Impact

Information Disclosure, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

19 October 2026

Updated

20 October 2026

Weakness

[CWE-346](https://cwe.mitre.org/data/definitions/346.html)

## Vendor fix

Update to the latest version with proper binding of attestation Evidence to TLS connection.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-112377](https://nvd.nist.gov/vuln/detail/CVE-2026-112377)
- [https://datatracker.ietf.org/doc/draft-intra-handshake-fail/](https://datatracker.ietf.org/doc/draft-intra-handshake-fail/)
- [https://github.com/CCC-Attestation/attested-tls-poc](https://github.com/CCC-Attestation/attested-tls-poc)
- [https://github.com/CCC-Attestation/attested-tls-poc/pull/58](https://github.com/CCC-Attestation/attested-tls-poc/pull/58)
- [https://github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formal](https://github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formal)
- [https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl\_tls13\_generic.c#L430-L436](https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436)
- [https://github.com/muhammad-usama-sardar/intra-handshake.fail](https://github.com/muhammad-usama-sardar/intra-handshake.fail)
- [https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attack](https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attack)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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