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.
CVE-2026-112377
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.4 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-19. A secondary CVSS source baseline 7.4; sources differ by 0.0.
- High severity, but no confirmed exploitation yet
An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.
- CVSS v3
- 7.4
- EG Score
- 7.4HIGHhigh confidence
- EG Risk
- 33EG Risk 33/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity74% × 45%Impact severity (EG Severity): CVSS 7.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.2% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release. - EPSS PROB
- 0.2%
- EPSS %ILE
- 7th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.4): severity, escalated by confirmed exploitation. This CVE's 7.4 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.4 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-20). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
October 19, 2026
Last Modified
October 20, 2026
Advisory Details (7)
Auto-updated Oct 19, 2026CCC Attestation SIG attested-tls-poc through commit 731ca82 Attestation Relay Attack | Advisories | VulnCheck
https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attackGitHub - CCC-Attestation/attested-tls-poc: Miscellaneous materials related to the "attested TLS" proof-of-concept · GitHub
https://github.com/CCC-Attestation/attested-tls-pocGitHub - muhammad-usama-sardar/intra-handshake.fail: Proof of insecurity of intra-handshake attestation · GitHub
https://github.com/muhammad-usama-sardar/intra-handshake.faildraft-intra-handshake-fail-55 - Early Attestation Considered Very Harmful (CVE-2026-100835 of CVSS 9.1, CVE-2026-92701 of CVSS 9.1, CVE-2026-92702 of CVSS 9.1, CVE-2026-100833 of CVSS 8.2, CVE-2026-33697 of CVSS 7.5, and 36 other CVEs of up to expected CVSS 10.0 upcoming)
https://datatracker.ietf.org/doc/draft-intra-handshake-fail/mbedtls/library/ssl_tls13_generic.c at f4ac7593826a506fc509c83cad73786acab1d442 · ionut-arm/mbedtls · GitHub
https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436attested-tls-poc/relay-attacks-formal at 5b6c5374b3fe8b671906c8ab32f6134d9c3da26d · CCC-Attestation/attested-tls-poc · GitHub
https://github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formalAdd proof of relay attacks
Fix merged in CCC-Attestation/attested-tls-poc PR #58 on 2026-07-17 — awaiting tagged release
https://github.com/CCC-Attestation/attested-tls-poc/pull/58Vendor Advisories for CVE-2026-112377(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 11× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-20 18:27 UTCEG score recompute
- 2026-10-20 18:27 UTCGHSA enrichmentGHSA-hqrh-qq2r-6h96 · GitHub severity CRITICAL · GitHub CVSS 7.4
- 2026-10-20 17:48 UTCEG score recompute
- 2026-10-20 17:48 UTCGHSA enrichmentGHSA-hqrh-qq2r-6h96 · GitHub severity CRITICAL · GitHub CVSS 7.4
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-19 21:36 UTCEG score recompute
- 2026-10-19 21:36 UTCGHSA enrichmentGHSA-hqrh-qq2r-6h96 · GitHub severity CRITICAL · GitHub CVSS 7.4
- 2026-10-19 18:26 UTCEG score recompute
- 2026-10-19 17:38 UTCEG score recomputeFirst assessed: 7.4 HIGH
- 2026-10-19 17:37 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
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