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CVE-2026-84716

📛 CVE Title

Automation-controller: automation-controller: instance install_bundle issues 10-year, non-revocable receptor mesh-ca certificates for caller-chosen (and case-variant impersonating) hostnames

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Description

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.

Overview

State
PUBLISHED
Assigner (CNA)
redhat
CVSS severity
MEDIUM
CVSS score
CVSS 6.6 / 10 6.6 6.6 / 10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N
Effective score
6.6 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-266
Reserved
2026-09-02
Published
2026-09-23 19:40 UTC
Last updated
2026-09-24 03:41 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/84xxx/CVE-2026-84716.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-09-23 20:17:18 UTC
NVD last modified
2026-09-24 04:18:02 UTC
NVD CVSS v3.1
CVSS 6.6 / 10 6.6 6.6 / 10 MEDIUM source: secalert@redhat.com
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N
Exploitability subscore
1.3 / 10
Impact subscore
4.7 / 10

NVD / KEV / EPSS data refreshed 2026-09-24 04:33 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-85611

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Affected products (5)
VendorProductVersionsPlatforms
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 0:4.6.33-1.el8ap (unaffected) —
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 0:4.6.33-1.el9ap (unaffected) —
Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:4.7.17-1.el9ap (unaffected) —
Red Hat Red Hat Ansible Automation Platform 2 — —
Red Hat Red Hat Ansible Automation Platform 2 — —

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-84716.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2.5::el8",
            "cpe:/a:redhat:ansible_automation_platform:2.5::el9",
            "cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8",
            "cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9",
            "cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8",
            "cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "automation-controller",
          "product": "Red Hat Ansible Automation Platform 2.5 for RHEL 8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.6.33-1.el8ap",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2.5::el8",
            "cpe:/a:redhat:ansible_automation_platform:2.5::el9",
            "cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8",
            "cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9",
            "cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8",
            "cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "automation-controller",
          "product": "Red Hat Ansible Automation Platform 2.5 for RHEL 9",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.6.33-1.el9ap",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2.6::el10",
            "cpe:/a:redhat:ansible_automation_platform:2.6::el9",
            "cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10",
            "cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9",
            "cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "automation-controller",
          "product": "Red Hat Ansible Automation Platform 2.6 for RHEL 9",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:4.7.17-1.el9ap",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2"
          ],
          "defaultStatus": "affected",
          "packageName": "ansible-automation-platform-26/controller-rhel9",
          "product": "Red Hat Ansible Automation Platform 2",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2"
          ],
          "defaultStatus": "affected",
          "packageName": "ansible-automation-platform-27/controller-rhel9",
          "product": "Red Hat Ansible Automation Platform 2",
          "vendor": "Red Hat"
        }
      ],
      "datePublic": "2026-09-23T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in the automation-controller instance\n                  install-bundle endpoint. When a System Administrator downloads\n                  an execution/hop node's install bundle, the controller signs an\n                  X.509 certificate with the receptor mesh certificate authority\n                  in which the Common Name, DNS subject-alternative-name, and\n                  receptor node-id are taken verbatim from the caller-chosen\n                  instance hostname, with a hard-coded ten-year validity, a random\n                  serial, and no issuance log or revocation list. Because the\n                  hostname charset validator is case-insensitive while the\n                  uniqueness validator is case-sensitive, an administrator can\n                  register a case variant of an existing control node's hostname\n                  and obtain a mesh-CA-signed certificate that TLS peers, which\n                  match hostnames case-insensitively, accept as that control node.\n                  In managed/hosted deployments \u2014 where the customer holds\n                  controller superuser but the platform operator runs the mesh \u2014\n                  this yields a long-lived, non-revocable mesh peer credential and,\n                  with an on-path position, TLS impersonation or interception of\n                  control/hybrid mesh nodes. It does not grant direct remote code\n                  execution, because receptor work submission is gated by a\n                  separate signing key not included in the bundle."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://access.redhat.com/security/updates/classification/",
              "value": "Moderate"
            },
            "type": "Red Hat severity rating"
          }
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-266",
              "description": "Incorrect Privilege Assignment",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T03:41:27.061Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "name": "RHSA-2026:71113",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:71113"
        },
        {
          "name": "RHSA-2026:71114",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:71114"
        },
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-84716"
        },
        {
          "name": "RHBZ#2527199",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2527199"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-02T01:03:49.507Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-09-23T00:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Automation-controller: automation-controller: instance install_bundle issues 10-year, non-revocable receptor mesh-ca certificates for caller-chosen (and case-variant impersonating) hostnames",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-266: Incorrect Privilege Assignment"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-84716",
    "datePublished": "2026-09-23T19:40:28.390Z",
    "dateReserved": "2026-09-02T01:03:53.834Z",
    "dateUpdated": "2026-09-24T03:41:27.061Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}