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TI-2026-70299 Aliases CVE-2026-108266

Privasys rustls RA-TLS attestation not bound to the TLS session

Priority MEDIUM 44CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-346.

Summary

Privasys rustls, a maintained fork of the rustls TLS library, before privasys-v0.8.1 emits RA-TLS challenge certificates whose quote ReportData is bound to the certificate public key and client nonce but not to the active TLS session. This is an origin validation error (CWE-346). An attacker who has obtained an enclave TLS private key can relay a genuine quote onto another connection, so a relying party accepts an attacker-terminated connection as the attested enclave.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00117 1st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Privasysrustls< privasys-v0.8.1—No fix listedCNA
  • rustls VendorPrivasys Affected < privasys-v0.8.1 Fixed in — No fix listed CNA

Remediation

Update Privasys rustls to privasys-v0.8.1, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-10 Threatist record created from CVE-2026-108266
  2. 2026-10-11 Priority changed: MEDIUM → LOW
  3. 2026-10-14 CISA SSVC decision points changed
  4. 2026-10-14 Priority changed: LOW → MEDIUM

References

Other 4

  • TI-2026-71258 Privasys attested TLS accepts evidence from other TEE platforms CVSS 4.0CRITICAL 9.1
  • TI-2026-70301 Privasys enclave-os-virtual RA-TLS quotes not bound to TLS session CVSS 4.0CRITICAL 9.1
  • TI-2026-70300 Privasys Go RA-TLS attestation not bound to the TLS session CVSS 4.0CRITICAL 9.1
  • TI-2026-70298 enclave-os-mini RA-TLS certificates not bound to TLS session CVSS 4.0CRITICAL 9.1
  • TI-2026-70302 RA-TLS challenge verifier in ra-tls-clients accepts relayed quotes CVSS 4.0CRITICAL 9.1
  • TI-2026-71257 Privasys ra-tls-clients trusts stale attestation after TLS setup CVSS 4.0HIGH 7.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences