High [CVE-2026-12382] missing requestHeadersToRemove allows mTLS bypass via Subject header spoofing
This high-severity Red Hat Linux advisory covers CVE-2026-12382 affecting Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9.
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Summary
A flaw was found in the AAP Gateway Envoy proxy configuration. The non-mTLS route to EDA event streams does not remove the Subject HTTP header from client requests, despite the source code defining requestHeadersToRemove for this header.
An unauthenticated remote attacker can inject a spoofed Subject header matching a legitimate client certificate DN to bypass mTLS authentication and inject arbitrary events into protected EDA event streams. This flaw affects AAP deployments that use mTLS-protected EDA external event streams.
Red Hat severity: Important — CVSS 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N). Weakness: CWE-290.
Affected Red Hat products: Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9; Red Hat Ansible Automation Platform 2.6 for RHEL 9; Red Hat Ansible Automation Platform 2.6; Red Hat Ansible Automation Platform 2.7. Red Hat fixing advisory: RHSA-2026:42078, RHSA-2026:13508, RHSA-2026:13545, RHSA-2026:42142.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- automation-gateway-0:2.5.20260715-1.el8ap
- automation-gateway-0:2.5.20260715-1.el9ap
- automation-gateway-0:2.6.20260422-1.el9ap
- ansible-automation-platform-26/gateway-rhel9:1777311120
- ansible-automation-platform-27/gateway-rhel9:1783919486
- RHSA-2026:42078
- RHSA-2026:13508
- RHSA-2026:13545
- RHSA-2026:42142
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- The following practices would help for avoiding exposure and mitigate this flaw: - Restrict network access to the non-mTLS EDA event stream route (/eda-event-streams/) at the firewall or load balancer level, allowing only trusted internal sources. - If mTLS-protected event streams are in use, ensure that only the /mtls/eda-event-streams/ route is accessible from untrusted networks. - Monitor EDA event stream activity for unexpected events_received counter increases that may indicate unauthorized event injection. - Review Envoy proxy logs for requests to the non-mTLS event stream route from unexpected source IPs.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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