CVE-2026-84716

CVE CVE-2026-84716EUVD EUVD-2026-85611Published 2026-09-23T19:40:28.000ZLast changed 2026-09-24T15:05:23.000ZCVSS 6.6

What the advisory describes

A flaw was found in the automation-controller instance install-bundle endpoint. When a System Administrator downloads an execution/hop node's install bundle, the controller signs an X.509 certificate with the receptor mesh certificate authority in which the Common Name, DNS subject-alternative-name, and receptor node-id are taken verbatim from the caller-chosen instance hostname, with a hard-coded ten-year validity, a random serial, and no issuance log or revocation list. Because the hostname charset validator is case-insensitive while the uniqueness validator is case-sensitive, an administrator can register a case variant of an existing control node's hostname and obtain a mesh-CA-signed certificate that TLS peers, which match hostnames case-insensitively, accept as that control node. In managed/hosted deployments — where the customer holds controller superuser but the platform operator runs the mesh — this yields a long-lived, non-revocable mesh peer credential and, with an on-path position, TLS impersonation or interception of control/hybrid mesh nodes. It does not grant direct remote code execution, because receptor work submission is gated by a separate signing key not included in the bundle.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Red Hat — Red Hat Ansible Automation Platform 2.5 for RHEL 8 patch: 0:4.6.33-1.el8ap
• Red Hat — Red Hat Ansible Automation Platform 2.5 for RHEL 9 patch: 0:4.6.33-1.el9ap
• Red Hat — Red Hat Ansible Automation Platform 2.6 patch: 1789673739
• Red Hat — Red Hat Ansible Automation Platform 2.6 for RHEL 9 patch: 0:4.7.17-1.el9ap
• Red Hat — Red Hat Ansible Automation Platform 2.7 patch: 1789580684

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Red Hat — Red Hat Ansible Automation Platform

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.