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  4. CVE 2026 108266 privasys rustls fork ra tls challenge mode did
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Back to active CVEs
Critical · CVSS 9.1CVE-2026-108266

Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS sessionCVE-2026-108266

Answer in brief

CVE-2026-108266 records a Critical severity (CVSS 9.1) vulnerability in Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS session. The current sources do not mark it as known exploited. The current feed maps Privasys/rustls (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 9, 2026Updated Oct 9, 2026Source checked Oct 9, 2026First seen by HOL Oct 9, 2026Material review Oct 9, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Privasys/rustls (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Privasys/rustlsgeneric<privasys-v0.8.1privasys-v0.8.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Privasys/rustls.
  2. 2Review the reported fix. Update Privasys/rustls to privasys-v0.8.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceprivasys.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragmentAlso CWE-346
  • enclave-os-mini: RA-TLS challenge certificates were not bound to the TLS sessionAlso CWE-346
  • Privasys Go fork: RA-TLS challenge mode did not bind attestation evidence to the TLS sessionAlso CWE-346
  • enclave-os-virtual: RA-TLS challenge certificates were not bound to the TLS sessionAlso CWE-346
  • ra-tls-clients: RA-TLS challenge verifier accepted quotes not bound to the TLS sessionAlso CWE-346
  • MariaDB: `qc_info` plugin can do OOB reads if query contains \0Same generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Oct 9, 2026
References
4 linked sources
Open source record