Critical severity · published Oct 9, 2026
CVE-2026-108266
Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS session
9.1
CVSS
0.1%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RU
rustls · Privasys
< privasys-v0.8.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-108266
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-108266
x_refsource_CONFIRM
https://github.com/Privasys/rustls/security/advisories/GHSA-j6qv-435v-r492
x_refsource_MISC
https://github.com/Privasys/rustls/commit/ab630583b58fee84260cbbfe2f4a8b45d8bde200
x_refsource_MISC
https://github.com/Privasys/rustls/releases/tag/privasys-v0.8.1
x_refsource_MISC
https://privasys.org/blog/binding-attestation-to-the-tls-session
