redhat confidential-compute-attestation CVE-2026-42784 vulnerability in Red Hat Products
Published on September 16, 2026

Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion
A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity.

NVD

Vulnerability Analysis

CVE-2026-42784 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
NONE

Timeline

Reported to Red Hat.

Made public. 139 days later.

Weakness Type

Improper Verification of Cryptographic Signature

The software does not verify, or incorrectly verifies, the cryptographic signature for data.


Products Associated with CVE-2026-42784

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Red Hat Confidential Compute Attestation
 
Red Hat Ansible Automation Platform
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Hummingbird
 
Red Hat Openshift
 
Red Hat Satellite
 
Red Hat Trusted Profile Analyzer
 

Affected Versions

Red Hat Confidential Compute Attestation: Red Hat Confidential Compute Attestation: Red Hat Confidential Compute Attestation: Red Hat Confidential Compute Attestation: Red Hat Confidential Compute Attestation: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat OpenShift Container Platform 4: Red Hat Satellite 6: Red Hat Satellite 6: Red Hat Trusted Profile Analyzer: Red Hat Trusted Profile Analyzer: