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 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
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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