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Advisory severityHigh8.2Red Hat Linux

High [CVE-2026-18141] Authentication bypass in Event-Driven Ansible via forged HTTP header

This high-severity Red Hat Linux advisory covers CVE-2026-18141 affecting Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Ansible Automation Platform 2.7.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-18141 Source published Source updated

VulniPulse record published Record updated

CVE-2026-18141
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

A flaw was found in aap-gateway, a component of Ansible Automation Platform's Event-Driven Ansible (EDA). An unauthenticated remote attacker can bypass mutual Transport Layer Security (mTLS) authentication for event streams.

This is achieved by manipulating the event stream URL and forging the HTTP Subject header. The system also inadvertently discloses the expected certificate subject in error messages, which simplifies the attack.

This vulnerability allows an attacker to inject arbitrary events into EDA, potentially triggering automated workflows. The vulnerability is exacerbated by information disclosure, where error messages reveal the expected certificate subject, simplifying targeted exploitation against default mTLS deployments.

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-295.

Affected Red Hat products: 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-2026:50336, RHSA-2026:50479, RHSA-2026:50340.

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 9 days ago·verify at source

Fixed versions
  • automation-eda-controller-0:1.2.11-1.el9ap
  • ansible-automation-platform-26/gateway-rhel9:1785780020
  • ansible-automation-platform-27/gateway-rhel9:1785435970
  • RHSA-2026:50336
  • RHSA-2026:50479
  • RHSA-2026:50340

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Restrict network access to the EDA event stream endpoints at the firewall or load balancer level. Ensure that only trusted sources are permitted to reach the event stream ports. Additionally, monitor EDA event logs for any unexpected events originating from unverified sources.

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Discussion(0)

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