CVE-2026-22696 in dcap-qvl
Summary
by MITRE • 01/27/2026
dcap-qvl implements the quote verification logic for DCAP (Data Center Attestation Primitives). A vulnerability present in versions prior to 0.3.9 involves a critical gap in the cryptographic verification process within the dcap-qvl. The library fetches QE Identity collateral (including qe_identity, qe_identity_signature, and qe_identity_issuer_chain) from the PCCS. However, it skips to verify the QE Identity signature against its certificate chain and does not enforce policy constraints on the QE Report. An attacker can forge the QE Identity data to whitelist a malicious or non-Intel Quoting Enclave. This allows the attacker to forge the QE and sign untrusted quotes that the verifier will accept as valid. Effectively, this bypasses the entire remote attestation security model, as the verifier can no longer trust the entity responsible for signing the quotes. All deployments utilizing the dcap-qvl library for SGX or TDX quote verification are affected. The vulnerability has been patched in dcap-qvl version 0.3.9. The fix implements the missing cryptographic verification for the QE Identity signature and enforces the required checks for MRSIGNER, ISVPRODID, and ISVSVN against the QE Report. Users of the `@phala/dcap-qvl-node` and `@phala/dcap-qvl-web` packages should switch to the pure JavaScript implementation, `@phala/dcap-qvl`. There are no known workarounds for this vulnerability. Users must upgrade to the patched version to ensure that QE Identity collateral is properly verified.
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Analysis
by VulDB Data Team • 01/27/2026
The vulnerability identified as CVE-2026-22696 resides within the dcap-qvl library, which serves as a critical component in the Data Center Attestation Primitives (DCAP) framework for Intel SGX and TDX environments. This library implements quote verification logic that is essential for establishing trust in remote attestation processes. The flaw represents a significant weakness in the cryptographic verification pipeline that undermines the fundamental security model of Intel's attestation infrastructure. The vulnerability affects all versions prior to 0.3.9 and specifically targets the verification of QE (Quoting Enclave) Identity collateral, which includes qe_identity, qe_identity_signature, and qe_identity_issuer_chain data structures that are crucial for validating the authenticity of quoting enclaves.
The technical implementation flaw stems from the library's failure to properly validate the cryptographic signature of the QE Identity data against its associated certificate chain. This omission creates a critical gap in the verification process where the system accepts potentially forged QE Identity information without proper authentication. The vulnerability operates at the intersection of multiple security controls, as it bypasses the necessary checks that should validate the MRSIGNER, ISVPRODID, and ISVSVN parameters within the QE Report. This allows an attacker to manipulate the QE Identity data to present a malicious or non-Intel quoting enclave as legitimate, effectively breaking the trust model that remote attestation relies upon. The flaw can be categorized under CWE-310 (Cryptographic Issues) and specifically manifests as a failure to validate digital signatures, which aligns with ATT&CK technique T1552.003 (Credentials in Files) and T1552.006 (Credentials in Registry).
The operational impact of this vulnerability is severe and far-reaching, affecting all deployments that utilize the dcap-qvl library for SGX or TDX quote verification. When exploited, the vulnerability enables attackers to forge QE signatures and generate untrusted quotes that will be accepted as valid by the verification system. This completely undermines the remote attestation security model, as the verifier can no longer trust the entity responsible for signing the quotes. The implications extend beyond individual systems to potentially compromise entire data center infrastructures that rely on Intel SGX and TDX technologies for confidential computing. The vulnerability affects not just the core DCAP functionality but also any applications or services that depend on the integrity of quote verification, including confidential computing platforms, secure enclaves, and remote attestation services. Organizations using the affected libraries face a critical risk of unauthorized access and data compromise, as the security guarantees provided by Intel's attestation framework are nullified.
The mitigation strategy requires immediate upgrade to dcap-qvl version 0.3.9, which implements the missing cryptographic verification for QE Identity signatures and enforces the required checks for MRSIGNER, ISVPRODID, and ISVSVN against the QE Report. The patch addresses the root cause by restoring proper signature validation and certificate chain verification mechanisms that were previously omitted. Users of the `phala/dcap-qvl-node` and `phala/dcap-qvl-web` packages are specifically advised to migrate to the pure JavaScript implementation `@phala/dcap-qvl` as an additional protective measure. No viable workarounds exist for this vulnerability, making the upgrade process mandatory for all affected systems. The fix aligns with security best practices by ensuring proper cryptographic validation and maintaining the integrity of the attestation process. Organizations should conduct thorough vulnerability assessments to identify all systems utilizing the affected library versions and implement the necessary upgrades as part of their security maintenance protocols. This vulnerability highlights the critical importance of proper cryptographic implementation in security-sensitive components and demonstrates how seemingly minor verification gaps can lead to complete security model compromises. The remediation process should also include monitoring for potential exploitation attempts and ensuring that all dependent systems are properly updated to maintain the security posture of the entire attestation infrastructure.