CVE-2026-108266 Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS session
Attackers can bypass RA-TLS attestation by relaying quotes across sessions, allowing impersonation of attested enclaves in the Privasys rustls fork.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108266?
CVE-2026-108266 is a critical vulnerability in Privasys rustls, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2026-108266?
How do I fix CVE-2026-108266?
No fix has been published for CVE-2026-108266 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-108266 being exploited?
There is no known exploitation of CVE-2026-108266 in the wild and no public exploit code.
Sources
Also known as AZL-107991, AZL-108000, AZL-108003, GHSA-j6qv-435v-r492.