---
id: CVE-2026-42784
title: A flaw was found in sequoia-openpgp
summary: >-
  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 at…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N'
cwe:
  - CWE-347
vendor: Red Hat
product: rust-podman-sequoia-main
affected:
  - rust-podman-sequoia-main (all versions)
  - openshift-sandboxed-containers/osc-monitor-rhel9 (all versions)
  - openshift-sandboxed-containers/osc-operator-bundle (all versions)
  - openshift-sandboxed-containers/osc-podvm-builder-rhel9 (all versions)
  - openshift-sandboxed-containers/osc-podvm-payload-rhel9 (all versions)
  - openshift-sandboxed-containers/osc-rhel9-operator (all versions)
  - ansible-automation-platform-26/hub-rhel9 (all versions)
  - ansible-automation-platform-27/hub-rhel9 (all versions)
  - python3.12-pysequoia (all versions)
  - rust-podman-sequoia (all versions)
  - rust-rpm-sequoia (all versions)
  - rust-sequoia-sq (all versions)
  - rust-sequoia-sqv (all versions)
  - trustee
  - trustee-guest-components (all versions)
  - rust-rpm-sequoia (all versions)
  - trustee-guest-components (all versions)
  - rust-rpm-sequoia (all versions)
  - kata-containers (all versions)
  - python3.12-pysequoia (all versions)
  - python-pysequoia (all versions)
  - rhtpa/rhtpa-trustification-service-rhel9 (all versions)
  - rhtpa/rhtpa-rhel10 (all versions)
patched:
  - hardened_images
published: '2026-09-16'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T09:17:08.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42784'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:42902'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-42784'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2464122'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42784.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-42784'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42784'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T18:12:18.297877Z'
epss: 0.00201
epssPercentile: 0.08797
ingestedAt: '2026-09-16T18:01:17.447Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Confidential Compute Attestation, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Hardened Images, Red Hat OpenShift Container Platform 4, … · no fix planned: Red Hat Trusted Profile Analyzer, Confidential Compute Attestation, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 10, … · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42784.json)
- **RHSA-2026:42902** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:42902)