A flaw was found in the Event-Driven Ansible (EDA) server. The ExternalEventStreamViewSet uses permissive access controls (permission_classes=[AllowAny], authentication_classes=[]) and relies solely on the Subject HTTP header value for mTLS authentication without verifying that the header originated from a trusted proxy. Additionally, the expected certificate Distinguished Name is leaked in the 403 error response body. An attacker who can reach the EDA API endpoint with a spoofed Subject header can inject arbitrary events into mTLS-protected event streams, triggering downstream automation actions.

The remote Redhat Enterprise Linux 10 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50336 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-controller: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)
    * automation-eda-controller: ExternalEventStreamViewSet trusts Subject header without validation and leaks     expected DN (CVE-2026-12383)
    * automation-eda-controller: Authentication bypass in Event-Driven Ansible via forged HTTP header     (CVE-2026-18141)
    * automation-gateway-proxy: Go net package: Denial of Service via long CNAME response in LookupCNAME     (CVE-2026-33811)
    * python3.12-aiohttp: Arbitrary code execution via untrusted input to CookieJar.load() (CVE-2026-34993)
    * python3.12-daphne: daphne: Denial of Service via excessive WebSocket message size (CVE-2026-44545)
    * python3.12-pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)
    * python3.12-pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)
    * python3.12-pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)
    * python3.12-pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)
    * python3.12-pillow: Native heap out-of-bounds write (CVE-2026-59197)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 REAL values (CVE-2026-59886)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER (CVE-2026-59885)
    * receptor: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers (CVE-2026-40898)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    For details about this release, refer to the release notes listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50319 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-controller: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)
    * automation-eda-controller: ExternalEventStreamViewSet trusts Subject header without validation and leaks     expected DN (CVE-2026-12383)
    * automation-gateway-proxy: Go net package: Denial of Service via long CNAME response in LookupCNAME     (CVE-2026-33811)
    * python3.12-aiohttp: Arbitrary code execution via untrusted input to CookieJar.load() (CVE-2026-34993)
    * python3.12-daphne: daphne: Denial of Service via excessive WebSocket message size (CVE-2026-44545)
    * python3.12-pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)
    * python3.12-pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)
    * python3.12-pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)
    * python3.12-pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)
    * python3.12-pillow: Native heap out-of-bounds write (CVE-2026-59197)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 REAL values (CVE-2026-59885)
    * python3.12-pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER (CVE-2026-59886)
    * receptor: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers (CVE-2026-40898)
    * receptor: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries     (CVE-2026-27145)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    For details about this release, refer to the release notes listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
331965	RHEL 10 / 9 : Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update (Important) (RHSA-2026:50336)	Nessus	Red Hat Local Security Checks	Local	high
331963	RHEL 8 / 9 : Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update (Important) (RHSA-2026:50319)	Nessus	Red Hat Local Security Checks	Local	high

Detections

Analytics

CVE-2026-12383

high

Tenable Plugins

high

high