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Paper/Archive/CVE-2026-112377

CVE-2026-112377

CCC-Attestation attested-tls-poc — CCC Attestation SIG attested-tls-poc through commit 731ca82 Attestation Relay Attack

EPSS 0.2%CVSS 9.1
critical.is priorityof 100
30
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 12.3.123 × 202.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
attested-tls-poc≤ 731ca82ed533fc7a1092be980887ae2e34261da2–CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchgithub.com/CCC-Attestation/attested-tls-poc/pull/58writeupgithub.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formalwriteupgithub.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436writeupdatatracker.ietf.org/doc/draft-intra-handshake-failwriteupgithub.com/muhammad-usama-sardar/intra-handshake.failrefgithub.com/CCC-Attestation/attested-tls-pocwriteupvulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attack