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

Quick assessment

Affected
Privasys rustls
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Privasys rustls 是 rustls TLS 库的一个维护性分支，增加了 RA-TLS 挑战和通道绑定支持。在 privasys-v0.8.1 版本之前，该分支生成的 RA-TLS 挑战证书中，quote 的 ReportData 虽然绑定到了证书公钥和客户端非ces（nonce），但未绑定到当前活跃的 TLS 会话。如果攻击者获取了某个可信执行环境（enclave）的 TLS 私钥，便可以将该 enclave 的真实 quote 中继到另一个连接上，从而导致依赖方错误地将由攻击者终止的连接识别为经过认

CVSS 9.1 · Critical EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
Privasys rustls < privasys-v0.8.1 affected
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I. Basic Information for CVE-2026-108266

Vulnerability Information
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Vulnerability Title
Privasys rustls fork: RA-TLS challenge mode did not bind attestation evidence to the TLS session
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Privasys rustls < privasys-v0.8.1 -

II. Public POCs for CVE-2026-108266

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III. Intelligence Information for CVE-2026-108266

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Vendor Advisories for CVE-2026-108266 (1)

Security Blog Posts for CVE-2026-108266 (1)

Vendor Pages for CVE-2026-108266 (1)

Same Patch Batch · Privasys · 2026-10-09 · 5 CVEs total

CVE-2026-108265 9.1 CRITICAL enclave-os-mini: RA-TLS challenge certificates were not bound to the TLS session
CVE-2026-108269 9.1 CRITICAL ra-tls-clients: RA-TLS challenge verifier accepted quotes not bound to the TLS session
CVE-2026-108267 9.1 CRITICAL Privasys Go fork: RA-TLS challenge mode did not bind attestation evidence to the TLS sessi
CVE-2026-108268 9.1 CRITICAL enclave-os-virtual: RA-TLS challenge certificates were not bound to the TLS session

IV. Related Vulnerabilities

Same product: rustls
Same vendor: Privasys
Same weakness: CWE-346

V. Comments for CVE-2026-108266

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