Vulnerability details
CVE-2026-112377
CCC-Attestation attested-tls-poc
CCC Attestation SIG attested-tls-poc through commit 731ca82 Attestation Relay Attack
CVSS 4.0
9.1Critical
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| 7.4High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| CCC-Attestation | attested-tls-poc | v ≤ 731ca82ed533fc7a1092be980887ae2e34261da2 | CVEProject cvelistV5 (CNA) |
References and advisories
7- https://github.com/CCC-Attestation/attested-tls-poc/pull/58 patchtechnical-descriptionissue-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
- https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attack third-party-advisory
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Details
- Published
- 2026-10-19
- Last updated
- 2026-10-20
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 17 · Low
Exploit prediction (EPSS)
0.21%
Probability of exploitation in 30 days
12.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-346Origin Validation Error