CVE-2026-42784

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

Published: Sep 16, 2026Updated: Sep 23, 2026 Sources: CVE List NVDCWE-347

7.4HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:NConfidentiality

None

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-347

Affected Products

Red Hat

commercial·US

Red Hat Hardened ImagesOn-premOS

Operating Systems / linux-distro

Confidential Compute AttestationOn-prem

Operating Systems / linux-distro

Red Hat Ansible Automation Platform 2On-premDev Tool

DevTools & CI / ci-cd

Red Hat Enterprise Linux 10On-premOS

Operating Systems / linux-distro

Red Hat OpenShift Container Platform 4SaaSSaaS Service

Cloud & SaaS / container-orchestration

Red Hat Satellite 6On-premOS

Operating Systems / linux-distro

Red Hat Trusted Profile AnalyzerOn-prem

Operating Systems / linux-distro

and 1 more affected products View all →

Exploitability

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://access.redhat.com/errata/RHSA-2026:42902

access.redhat.com

https://access.redhat.com/security/cve/CVE-2026-42784

access.redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2464122

bugzilla.redhat.com

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