CVE-2026-42784

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

publishedCWE-347

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.

Technical severity7.4 highCVSS 3.1 · CNA: redhat

Published2026-09-16Source updated 2026-11-03

Collected2026-11-032 attributed sources

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Ansible Automation Platform 2.6 for RHEL 9 Red Hat `python3.12-pysequoia` https://access.redhat.com/downloads/content/package-browser/	≥ 0:0.1.34-1.el9ap; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `rust-rpm-sequoia` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.10.2.1-1.el10_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `rust-sequoia-sqv` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.3.0.2-1.el10_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `rust-sequoia-sq` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.4.0.1-2.el10_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `rust-rpm-sequoia` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.10.2.1-1.el9_8; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Cost Management On-Premise 1 Red Hat `costmanagement/costmanagement-ui-rhel10` https://catalog.redhat.com/software/containers/	≥ 1791460851; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Hardened Images Red Hat `rust-podman-sequoia-main` https://catalog.redhat.com/software/containers/	≥ 0.3.2-4.hum1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Confidential Compute Attestation Red Hat `openshift-sandboxed-containers/osc-monitor-rhel9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Confidential Compute Attestation Red Hat `openshift-sandboxed-containers/osc-operator-bundle` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Confidential Compute Attestation Red Hat `openshift-sandboxed-containers/osc-podvm-builder-rhel9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Confidential Compute Attestation Red Hat `openshift-sandboxed-containers/osc-podvm-payload-rhel9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Confidential Compute Attestation Red Hat `openshift-sandboxed-containers/osc-rhel9-operator` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Ansible Automation Platform 2 Red Hat `ansible-automation-platform-26/hub-rhel9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Ansible Automation Platform 2 Red Hat `ansible-automation-platform-27/hub-rhel9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `rust-podman-sequoia` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `trustee` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `trustee-guest-components` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `trustee-guest-components` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Hardened Images Red Hat `rust-rpm-sequoia` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `kata-containers` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Satellite 6 Red Hat `python3.12-pysequoia` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Satellite 6 Red Hat `python-pysequoia` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Trusted Profile Analyzer Red Hat `rhtpa/rhtpa-trustification-service-rhel9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Trusted Profile Analyzer Red Hat `rhtpa/rhtpa-rhel10` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.4 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N`	CNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:34160CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42078CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42902CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:76733CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:76734CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:76735CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:76737CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:79357CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-42784CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2464122CNA: redhat · issue-tracking, x_refsource_REDHAT

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