CVE-2026-112377: CCC-Attestation attested-tls-poc

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

CVSS 9.1 CriticalCriticalEPSS 0.0022 · 12th percentile

Critical, because:

CVSS score 9.1: 9.0 or more.

Published by the CVE Program (CNA: VulnCheck) at 19 Oct 2026, 17:26 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
CCC-Attestation	attested-tls-poc https://github.com/CCC-Attestation/attested-tls-poc pkg:github/ccc-attestation/attested-tls-poc	affected 731ca82ed533fc7a1092be980887ae2e34261da2 and earlier git Other versions: unaffected

Identifiers

CVE-2026-112377

CNA

VulnCheck

Weakness (CWE)

CWE-346

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.1	Critical	4.0	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	CNA (VulnCheck)Used for this record
7.4	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0022, the 12th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 19 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/CCC-Attestation/attested-tls-poc/pull/58 patchtechnical-descriptionissue-tracking
github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formal technical-description
github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436 technical-description
datatracker.ietf.org/doc/draft-intra-handshake-fail/ technical-description
github.com/muhammad-usama-sardar/intra-handshake.fail technical-description
github.com/CCC-Attestation/attested-tls-poc product
www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attack third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.