Key Flag Confusion in Sequoia-OpenPGP Library Affecting Red Hat
CVE-2026-42784

7.4HIGH

Key Information:

Vendor

Red Hat
Status
Confidential Compute Attestation
Red Hat Ansible Automation Platform 2
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 9
Vendor
CVE Published:
16 September 2026

What is CVE-2026-42784?

A critical flaw exists in the Sequoia-OpenPGP library, where the inference of key flags for older certificates is inaccurately handled when a key flags subpacket is absent. This discrepancy can lead to significant security issues, as it permits an attacker to circumvent the back-signature verification process. As a result, malicious actors can falsely bind arbitrary subkeys to their own certificates, allowing them to forge signatures and severely undermine the cryptographic integrity that is essential for secure communications.

References

https://access.redhat.com/security/cve/CVE-2026-42784
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2464122
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.