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    CVE-2026-42784

    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.

    Published:Sep 16, 2026
    Last Modified:Oct 9, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00214
    CVSS Score:7.4

    Affected Products

    Vendor
    Red Hat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Ansible Automation Platform
    Vendor
    Redhat
    Product
    Ansible Automation Platform Developer
    Vendor
    Redhat
    Product
    Confidential Compute Attestation
    Vendor
    Redhat
    Product
    Cost Management On Premise
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Hardened Images
    Vendor
    Redhat
    Product
    Hummingbird
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Satellite
    Vendor
    Redhat
    Product
    Satellite 6
    Vendor
    Redhat
    Product
    Trusted Profile Analyzer
    Vendor
    Sequoia-pgp
    Product
    Sequoia-openpgp

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-42784 — Red_Hat, Redhat + (High 7.4) | CVE-DB