CVE-2026-108266 (GCVE-0-2026-108266)

Vulnerability from cvelistv5 – Published: 2026-10-09 21:00 – Updated: 2026-10-09 21:00
VLAI
Title
Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS session
Summary
Privasys rustls is a maintained fork of the rustls TLS library that adds RA-TLS challenge and channel-binding support. Prior to privasys-v0.8.1, the fork emitted RA-TLS challenge certificates whose quote ReportData was bound to the certificate public key and client nonce but not to the active TLS session. An attacker who obtained an enclave TLS private key could relay a genuine quote onto another connection, causing a relying party to accept an attacker-terminated connection as the attested enclave. This issue is fixed in privasys-v0.8.1.
Severity
9.1 (Critical)
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
CWE
  • CWE-346 - Origin Validation Error
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7642 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Privasys rustls Affected: < privasys-v0.8.1
guessed Create a notification for this product.
Show details on NVD website
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        }
      ],
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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          }
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            }
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      "providerMetadata": {
        "dateUpdated": "2026-10-09T21:00:19.595Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Privasys/rustls/security/advisories/GHSA-j6qv-435v-r492",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Privasys/rustls/security/advisories/GHSA-j6qv-435v-r492"
        },
        {
          "name": "https://github.com/Privasys/rustls/commit/ab630583b58fee84260cbbfe2f4a8b45d8bde200",
          "tags": [
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          "url": "https://github.com/Privasys/rustls/commit/ab630583b58fee84260cbbfe2f4a8b45d8bde200"
        },
        {
          "name": "https://github.com/Privasys/rustls/releases/tag/privasys-v0.8.1",
          "tags": [
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          "url": "https://github.com/Privasys/rustls/releases/tag/privasys-v0.8.1"
        },
        {
          "name": "https://privasys.org/blog/binding-attestation-to-the-tls-session",
          "tags": [
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          "url": "https://privasys.org/blog/binding-attestation-to-the-tls-session"
        }
      ],
      "source": {
        "advisory": "GHSA-j6qv-435v-r492",
        "discovery": "UNKNOWN"
      },
      "title": "Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS session"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-108266",
    "datePublished": "2026-10-09T21:00:19.595Z",
    "dateReserved": "2026-10-09T17:33:15.410Z",
    "dateUpdated": "2026-10-09T21:00:19.595Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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                "versions": [
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            "value": "Privasys rustls is a maintained fork of the rustls TLS library that adds RA-TLS challenge and channel-binding support. Prior to privasys-v0.8.1, the fork emitted RA-TLS challenge certificates whose quote ReportData was bound to the certificate public key and client nonce but not to the active TLS session. An attacker who obtained an enclave TLS private key could relay a genuine quote onto another connection, causing a relying party to accept an attacker-terminated connection as the attested enclave. This issue is fixed in privasys-v0.8.1."
          }
        ],
        "id": "CVE-2026-108266",
        "lastModified": "2026-10-09T21:17:05.023",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
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                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
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                "vulnConfidentialityImpact": "HIGH",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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            }
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            "url": "https://privasys.org/blog/binding-attestation-to-the-tls-session"
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        "vulnStatus": "Received",
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      }
    }
  }
}



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