CVE-2026-42784

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

State: Published
Severity: 7.4 High
Published: Sep 16, 2026
Updated: Oct 15, 2026
Reserved: Apr 29, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N	redhat

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
Red Hat Ansible Automation Platform 2.6 for RHEL 9Red Hat	0:0.1.34-1.el9ap and laterNot affected
Red Hat Enterprise Linux 10Red Hat	0:1.10.2.1-1.el10_2 and laterNot affected
Red Hat Enterprise Linux 10Red Hat	0:1.3.0.2-1.el10_2 and laterNot affected
Red Hat Enterprise Linux 10Red Hat	0:1.4.0.1-2.el10_2 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.10.2.1-1.el9_8 and laterNot affected
Red Hat Cost Management On-Premise 1Red Hat	1791460851 and laterNot affected
Red Hat Hardened ImagesRed Hat	0.3.2-4.hum1 and laterNot affected
Confidential Compute AttestationRed Hat
Confidential Compute AttestationRed Hat
Confidential Compute AttestationRed Hat
Confidential Compute AttestationRed Hat
Confidential Compute AttestationRed Hat
Red Hat Ansible Automation Platform 2Red Hat
Red Hat Ansible Automation Platform 2Red Hat
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat Hardened ImagesRed Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat Satellite 6Red Hat
Red Hat Satellite 6Red Hat
Red Hat Trusted Profile AnalyzerRed Hat
Red Hat Trusted Profile AnalyzerRed Hat

References

RHSA-2026:34160vendor-advisory
RHSA-2026:42078vendor-advisory
RHSA-2026:42902vendor-advisory
RHSA-2026:76733vendor-advisory
RHSA-2026:76734vendor-advisory
RHSA-2026:76735vendor-advisory
RHSA-2026:76737vendor-advisory
RHSA-2026:79357vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-42784vdb-entry
RHBZ#2464122issue-tracking

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