mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds read and a one-byte out-of-bounds write exist in the state-cookie parser of `mod_auth_openidc`. The issue is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that rejects or normalizes malformed `Cookie` headers (tokens lacking `=`) can reduce exposure, but upgrading is the recommended remediation.

The Rocky Linux 9.6 host has a package installed that is affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_1567 advisory.

    This advisory aggregates security fixes for the mod_auth_openidc SRPM in CIQ LTS 9.6. It addresses 11     CVEs: CVE-2025-3891, CVE-2024-24814, CVE-2025-31492, CVE-2021-32791, CVE-2021-32786, and 6 more.

Tenable has extracted the preceding description block directly from the CIQ 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 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:69715 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:69716 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:69718 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:69720 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:69717 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:69713 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:69719 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:69712 advisory.

    The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an     Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

    Security Fix(es):

    * mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing     (CVE-2026-54789)

    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.

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

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

The remote Debian 13 host has a package installed that is affected by a vulnerability as referenced in the dsa-6504 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6504-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     September 17, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libapache2-mod-auth-openidc     CVE ID         : CVE-2026-54789

    It was discovered that incorrect state cookie parsing in     mod_auth_openidc, an OpenID Certified authentication and authorisation     module for the Apache HTTP server that implements the OpenID Connect     Relying Party functionality, could result in denial of service.

    For the stable distribution (trixie), this problem has been fixed in     version 2.4.17-1+deb13u1.

    We recommend that you upgrade your libapache2-mod-auth-openidc packages.

    For the detailed security status of libapache2-mod-auth-openidc please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libapache2-mod-auth-openidc

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

The version of mod_auth_openidc installed on the remote host is prior to 1.8.8-7. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3920 advisory.

    mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP     server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds     read and a one-byte out-of-bounds write exist in the state-cookie parser of `mod_auth_openidc`. The issue     is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is     rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that     rejects or normalizes malformed `Cookie` headers (tokens lacking `=`) can reduce exposure, but upgrading     is the recommended remediation. (CVE-2026-54789)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-2155 advisory.

    mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP     server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds     read and a one-byte out-of-bounds write exist in the state-cookie parser of `mod_auth_openidc`. The issue     is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is     rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that     rejects or normalizes malformed `Cookie` headers (tokens lacking `=`) can reduce exposure, but upgrading     is the recommended remediation. (CVE-2026-54789)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21717-1 advisory.

    This update for apache2-mod_auth_openidc fixes the following issue:

    - CVE-2026-54789: out-of-bounds read and one-byte out-of-bounds write in the state-cookie parser of     `mod_auth_openidc`       (bsc#1276217).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote Debian 12 host has a package installed that is affected by a vulnerability as referenced in the dla-4768 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4768-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Daniel Leidert     September 02, 2026                            https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libapache2-mod-auth-openidc     Version        : 2.4.12.3-2+deb12u5     CVE ID         : CVE-2026-54789

    A vulnerability has been found in mod_auth_openidc, an OpenID Certified     authentication and authorization module for the Apache 2.x HTTP server     that implements the OpenID Connect Relying Party functionality.

    CVE-2026-54789

       An out-of-bounds read and a one-byte out-of-bounds write in the        state-cookie parser can lead to a DOS.


    For Debian 12 bookworm, this problem has been fixed in version     2.4.12.3-2+deb12u5.

    We recommend that you upgrade your libapache2-mod-auth-openidc packages.

    For the detailed security status of libapache2-mod-auth-openidc please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libapache2-mod-auth-openidc

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP     server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds     read and a one-byte out-of-bounds write exist in the state-cookie parser of `mod_auth_openidc`. The issue     is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is     rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that     rejects or normalizes malformed `Cookie` headers (tokens lacking `=`) can reduce exposure, but upgrading     is the recommended remediation. (CVE-2026-54789)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
354849	Rocky Linux 9.6 [CIQ] Security Update: mod_auth_openidc Multiple Vulnerabilities (ciqsa-2026_1567)	Nessus	Rocky Linux Local Security Checks	Local	high
348719	RHEL 7 : mod_auth_openidc (RHSA-2026:69715)	Nessus	Red Hat Local Security Checks	Local	high
348717	RHEL 9 : mod_auth_openidc (RHSA-2026:69716)	Nessus	Red Hat Local Security Checks	Local	high
348716	RHEL 9 : mod_auth_openidc (RHSA-2026:69718)	Nessus	Red Hat Local Security Checks	Local	high
348715	RHEL 9 : mod_auth_openidc (RHSA-2026:69720)	Nessus	Red Hat Local Security Checks	Local	high
348714	RHEL 8 : mod_auth_openidc:2.3 (RHSA-2026:69717)	Nessus	Red Hat Local Security Checks	Local	high
348713	RHEL 8 : mod_auth_openidc:2.3 (RHSA-2026:69713)	Nessus	Red Hat Local Security Checks	Local	high
348712	RHEL 10 : mod_auth_openidc (RHSA-2026:69719)	Nessus	Red Hat Local Security Checks	Local	high
348711	RHEL 8 : mod_auth_openidc:2.3 (RHSA-2026:69712)	Nessus	Red Hat Local Security Checks	Local	high
346982	Debian dsa-6504 : libapache2-mod-auth-openidc - security update	Nessus	Debian Local Security Checks	Local	high
345817	Amazon Linux 2 : mod_auth_openidc (ALAS-2026-3920)	Nessus	Amazon Linux Local Security Checks	Local	high
345791	Amazon Linux 2023 : mod_auth_openidc (ALAS2023-2026-2155)	Nessus	Amazon Linux Local Security Checks	Local	high
342575	openSUSE 16 Security Update : apache2-mod_auth_openidc (openSUSE-SU-2026:21717-1)	Nessus	SuSE Local Security Checks	Local	high
342373	Debian dla-4768 : libapache2-mod-auth-openidc - security update	Nessus	Debian Local Security Checks	Local	high
338802	Linux Distros Unpatched Vulnerability : CVE-2026-54789	Nessus	Misc.	Local	high

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