Update Privasys Go to v0.5.1 to Stop Attackers Bypassing Security via CVE-2026-108267

System administrators must update Privasys Go immediately to address a critical security flaw that undermines remote attestation. The vulnerability, identified as CVE-2026-108267, allows attackers to bypass security controls by relaying valid attestation certificates. This issue affects all versions of the software prior to privasys-v0.5.1-go1.26.5. The National Vulnerability Database rates the flaw as critical with a CVSS score of 9.1.

In plain English

Privasys Go is a specialized version of the Go programming language that adds support for Remote Attestation over TLS. This feature allows servers to prove their identity and integrity to clients. The flaw exists in how the software binds attestation data to active TLS sessions. Specifically, challenge-mode RA-TLS certificates bind quote ReportData to the public key and client nonce. However, they do not bind this data to the active TLS session itself.

This missing binding creates a relay opportunity for attackers. An adversary who obtains an enclave TLS private key can capture a genuine quote. They can then replay this quote onto a different connection. The relying party accepts the handshake as if it came from the legitimate enclave. This allows the attacker to impersonate a trusted enclave without possessing the correct session context.

The background

The issue stems from the design of the RA-TLS implementation in earlier versions. According to the NVD record, the weakness is classified as CWE-346, which relates to origin validation errors. The vulnerability was present in all releases before the specific fix version. It impacts the crypto/tls package within the Privasys Go fork.

The attack requires the adversary to first obtain an enclave TLS private key. Once in possession of this key, they can perform the relay attack. The relying party cannot distinguish between a legitimate handshake and a relayed one. This breaks the trust model that remote attestation is supposed to provide. The flaw does not require the attacker to break encryption, only to reuse existing valid data.

What changes now

The vendor has released a fix for this vulnerability in version privasys-v0.5.1-go1.26.5. This update corrects the binding of quote ReportData to the active TLS session. Users running any version prior to this must upgrade to prevent exploitation. The fix ensures that attestation quotes are tied to the specific session in which they were generated.

Organizations using Privasys Go for secure enclave communications should verify their current version immediately. Failure to patch leaves systems vulnerable to enclave impersonation attacks. The critical rating reflects the high impact of bypassing attestation controls. Security teams should treat this as an urgent priority for their infrastructure.

What to do and how to stay safe: Privasys Go

• Check all servers and development environments for Privasys Go versions older than privasys-v0.5.1-go1.26.5.
• Upgrade affected systems to the latest patched version to restore proper session binding for attestation.
• Monitor network logs for unusual TLS handshake patterns that might indicate relay attempts or impersonation.
• Review access controls for enclave TLS private keys to prevent unauthorized acquisition by potential attackers.

Step-by-step guide: Risk-Based Vulnerability Management: Benefits, Limits, and Reality

General security guidance from the Vector Update newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is CVE-2026-108267?

It is a critical vulnerability in Privasys Go that allows attackers to relay RA-TLS certificates, bypassing attestation checks.

Which versions are affected?

All versions of Privasys Go prior to privasys-v0.5.1-go1.26.5 are affected by this vulnerability.

Is there a fix available?

Yes, the issue is fixed in version privasys-v0.5.1-go1.26.5, and users should upgrade to this release.