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Vulnerability details

CVE-2026-92701

ultravioletrs cocos

Cocos AI: Intra-handshake attested TLS implementation is vulnerable to session-misbinding attacks for Intel TDX verifier path

CVSS 3.1
9.1Critical

Official description

Cocos AI is a confidential computing system for AI. In Cocos AI 0.8.2 and earlier, VerifTeeAttestation in the Intel TDX aTLS verifier receives an expected current-session value but does not apply it to TdQuoteBodyPolicy.ReportData before validating TDX QuoteV4 evidence. The verifier can consequently accept structurally valid evidence containing mismatched or reused REPORT_DATA for the current TLS session, causing the relying party to release application data or make a trust or authorization decision for an unrelated attestation context. This issue was fixed in Cocos AI 0.9.0 by removing the affected verifier path as part of the migration to post-handshake attestation.

CVSS scores

ScoreVersionSourceVector
9.1Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

VendorProductVersionsSource
ultravioletrs cocos < 0.9.0 CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-09-18
Last updated
2026-10-13
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.21%
Probability of exploitation in 30 days
12.4%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-346
    Origin Validation Error
  • CWE-354
    Improper Validation of Integrity Check Value