Vulnerability · Published Oct 19, 2026 · Assigned by VulnCheck

CVE-2026-112377CCC Attestation SIG attested-tls-poc through commit 731ca82 Attestation Relay Attack

High 7.4

In plain English

A high-severity security flaw in attested-tls-poc from CCC-Attestation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.2%top 87.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

CCC Attestation SIG attested-tls-poc through commit 731ca82 fails to bind early attestation Evidence to the TLS connection, allowing attackers to relay valid Evidence from a genuine attester. Attackers holding an extracted attested TLS private key can forward the relying party's nonce to a genuine attester and replay its Evidence to impersonate the attested workload and intercept data.

Affected products (as reported)

Vendor	Product	Versions
CCC-Attestation	attested-tls-poc	0 – through 731ca82ed533fc7a1092be980887ae2e34261da2

Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Pull Request #58 patch, technical-description, issue-tracking
https://github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formal technical-description
https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436 technical-description
https://datatracker.ietf.org/doc/draft-intra-handshake-fail/ technical-description
https://github.com/muhammad-usama-sardar/intra-handshake.fail technical-description
https://github.com/CCC-Attestation/attested-tls-poc product
VulnCheck Advisory: CCC Attestation SIG attested-tls-poc through commit 731ca82 Attestation Relay Attack third-party-advisory