Privasys ra-tls-clients Fixes Critical TLS Attestation Bypass in Version 0.11.0

Privasys has released version 0.11.0 of its ra-tls-clients to address a critical security flaw that allowed attackers to impersonate secure endpoints. The vulnerability, tracked as CVE-2026-108362, affects all versions of the multi-language utilities prior to the latest update and enables unauthorized access through forged attestation evidence.

The issue stems from how the client handles Trusted Execution Environment (TEE) attestation evidence. According to the National Vulnerability Database record, the software accepted this evidence without verifying an explicitly authorized platform identity. This oversight meant that verifiers could not distinguish between the intended attester and a different, unrevoked TEE platform if the measurements appeared valid.

Context and Background

The vulnerability is classified as critical with a CVSS score of 9.1, indicating severe risk to systems relying on these clients for secure connections. The weakness is categorized under CWE-346, which relates to insufficient verification of data authenticity. This classification highlights the failure to properly validate the source of the attestation data during the TLS handshake process.

Privasys Remote Attestation TLS Clients provide tools for verifying attested TLS connections across multiple programming languages. These utilities are designed to ensure that communications occur with trusted hardware environments. The flaw compromised this trust model by allowing invalid sources to pass verification checks if they possessed valid measurements from any unrevoked platform.

An attacker positioned on the network could exploit this by forging evidence or extracting secrets from a compromised but still unrevoked platform. Once the attacker obtained these secrets, they could generate valid measurements that the verifier would accept as coming from the legitimate endpoint. This effectively allowed the attacker to impersonate the attested TLS endpoint, bypassing security controls designed to prevent such intrusion.

Who Is Affected

Users of Privasys ra-tls-clients versions older than 0.11.0 are directly affected by this vulnerability. Any organization or individual using these specific utilities to verify attested TLS connections is at risk if they have not updated their software. The impact is particularly severe for environments that rely on TEE attestation for high-security communications.

The National Vulnerability Database confirms that the fix is available in version 0.11.0. Organizations should verify their current installation versions immediately to determine if they are vulnerable. Systems running the patched version are no longer susceptible to this specific method of endpoint impersonation.

What should you do?

Security teams should prioritize updating Privasys ra-tls-clients to version 0.11.0 or later to mitigate this critical risk. Since the vulnerability allows for endpoint impersonation, organizations should also review network logs for any unusual attestation patterns that may indicate exploitation. Monitoring for unauthorized platform identities can help detect potential abuse of the flaw before patches are applied.