CVE-2026-112377 PUBLISHED

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.

• Muhammad Usama Sardar finder

• Pull Request #58
• 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://datatracker.ietf.org/doc/draft-intra-handshake-fail/
• https://github.com/muhammad-usama-sardar/intra-handshake.fail
• https://github.com/CCC-Attestation/attested-tls-poc
• VulnCheck Advisory: CCC Attestation SIG attested-tls-poc through commit 731ca82 Attestation Relay Attack

• Origin Validation Error CWE