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CVE-2026-42784VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-42784· High 7.4

Not known to be exploited · CVSS 7.4 High.

Data as of 3 Nov 2026, 18:59 UTC

CVSS 3.1 base score
7.4High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.17.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Ansible Automation Platform 2.6 for RHEL 9python3.12-pysequoiaAffected–Fixed in–
Red Hat Enterprise Linux 10rust-rpm-sequoiaAffected–Fixed in–
Red Hat Enterprise Linux 10rust-sequoia-sqvAffected–Fixed in–
Red Hat Enterprise Linux 10rust-sequoia-sqAffected–Fixed in–
Red Hat Enterprise Linux 9rust-rpm-sequoiaAffected–Fixed in–
Red Hat Cost Management On-Premise 1costmanagement/costmanagement-ui-rhel10Affected–Fixed in–

AI-suggested

Red Hat has released updated RPM packages (podman-sequoia-0.3.2-4.hum1) for affected architectures to fix this vulnerability. Users should apply these updates as detailed in the Red Hat advisory. Currently, no alternative mitigations meet Red Hat's criteria for ease of use, deployment, or applicability. Therefore, applying the official update is the recommended remediation.

Description

CVE-2026-42784 is a vulnerability in the sequoia-openpgp library where missing key flags in older certificates cause incorrect inference of key capabilities. This flaw allows attackers to bypass the back-signature check, enabling them to illegitimately bind arbitrary subkeys to their own certificates and forge signatures. This compromises cryptographic integrity in affected Red Hat Hardened Images RPMs that use sequoia-openpgp. No mitigation is currently available that meets Red Hat's criteria for ease of use and deployment. A security update including fixed RPMs has been released by Red Hat.

References

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