7.4 High

CVE-2026-42784 Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion

Description

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.

CVSS 3.1 detail

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

Exploitable remotely over the network, without an account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Privileges required: None
Interaction: Required
Scope: Changed
Confidentiality: None
Integrity: High
Availability: None

Affected products and versions

Product	Affected versions	Fixed in
Confidential Compute Attestation	Versions not published
Red Hat Ansible Automation Platform 2	Versions not published
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 9	Versions not published
Red Hat Hardened Images 1.10	earliest → < 1.10.3-0.3.hum1	1.10.3-0.3.hum1
Red Hat OpenShift Container Platform 4	Versions not published
Red Hat Satellite 6	Versions not published
Red Hat Trusted Profile Analyzer	Versions not published
Red Hat Cost Management On-Premise 1 1791460851	earliest → < 1791460851	1791460851

Show the other branch

Product	Affected versions	Fixed in
Red Hat Ansible Automation Platform 2.6 for RHEL 9	Versions not published

References

RHSA-2026:34160 access.redhat.com
RHSA-2026:42078 access.redhat.com
RHSA-2026:42902 access.redhat.com
RHSA-2026:76733 access.redhat.com
RHSA-2026:76734 access.redhat.com
RHSA-2026:76735 access.redhat.com
RHSA-2026:76737 access.redhat.com
RHSA-2026:79357 access.redhat.com
RHSA-2026:94791 access.redhat.com
access.redhat.com access.redhat.com
RHBZ#2464122 bugzilla.redhat.com

Timeline

Published September 16, 2026
Last modified November 4, 2026

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