External risk intelligence

Enclave OS Mini RA-TLS Quote Spoofing Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-108265

The vulnerability exists in an SGX-based runtime environment for confidential computing applications. While these applications may utilize network-based TLS, they are typically specialized, isolated, and deployed within secure enclave architectures rather than serving as common, public-facing internet services.

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security vulnerability was identified in the Enclave OS Mini runtime, which is used for confidential applications within Intel SGX enclaves. This issue could allow an attacker to impersonate a legitimate enclave by relaying a genuine security quote. The primary concern is confirming if this specialized technology is in use within the organization, as its impact is likely limited to specific, isolated environments.

A security flaw allowed enclave impersonation.
This affects specialized confidential computing.
Confirm relevance; impact is likely contained.

Attack Path

How an attacker could exploit the issue

An attacker with access to a confidential enclave's private key could potentially impersonate that enclave. This is achieved by reusing a valid quote containing specific session information on a new connection, tricking a trusting party into accepting a connection controlled by the attacker as legitimate. This could allow the attacker to establish a malicious session that appears to be from the genuine enclave.

Requires enclave private key.
Relaying a genuine quote on a new connection.
Accepting attacker connections as genuine.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to impersonate a legitimate enclave by replaying a valid attestation. This occurs when an attacker obtains an enclave's TLS private key and uses it to relay a genuine quote to a relying party, causing them to trust a connection terminated by the attacker.

Enclave TLS private key at risk.
Attacker replays enclave quote on new connection.
Relying party accepts attacker-terminated connection.

Operational Fix

Recommended remediation, mitigation, and detection steps

Platform teams and application owners are likely responsible for addressing this vulnerability in Enclave OS Mini, as it affects the runtime for confidential computing applications. The initial practical step is to identify all deployments of Enclave OS Mini, determine their reachability and criticality, and then assign ownership for remediation planning based on risk.

Platform or application owners should take ownership.
Verify enclave deployments and network exposure.
Plan remediation during the next maintenance window.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Enclave OS Mini?

Enclave OS Mini is a specialized Rust-based runtime designed to host confidential applications within Intel SGX enclaves. It provides the necessary infrastructure for these applications to run in isolated, hardware-protected memory regions, ensuring data security and confidentiality while the code is being processed.

How does this CVE-2026-108265 vulnerability work?

This flaw is a form of improper validation of consistency (CWE-346). The runtime failed to cryptographically link the remote attestation quote to the specific active TLS session. Because the quote did not include a value bound to that unique session, it became possible to reuse, or relay, a valid quote from one connection to another, bypassing security checks.

When can an attacker trigger this issue?

An attacker must already possess an enclave's TLS private key to exploit this. They then use that key to relay a legitimate attestation quote onto a different connection. Simply having network access is insufficient; the attack relies on the ability to manipulate the connection handshake while having illicit access to the enclave's sensitive cryptographic material.

Is my infrastructure at risk from this vulnerability?

According to Halo Surface Signal, risk is unlikely for most organizations. Since Enclave OS Mini is used for specialized, isolated confidential computing rather than standard internet-facing services, your exposure depends on whether you have deployed these specific enclave architectures. It is not a common web-server vulnerability.

How should I respond to this threat?

First, locate all instances of Enclave OS Mini within your environment. Once you identify these deployments, verify their version; releases prior to wasm-v0.40.0 are affected. Coordinate with the application owners to plan an update to version v0.40.0 or later to ensure proper TLS session binding is enforced.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.