Bug 2521051 (CVE-2026-54789) - CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing
Summary: CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malf...
Keywords:
Status: NEW
Alias: CVE-2026-54789
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2523272
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-21 16:33 UTC by OSIDB Bzimport
Modified: 2026-11-10 22:13 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:69712 0 None None None 2026-09-22 00:43:51 UTC
Red Hat Product Errata RHSA-2026:69713 0 None None None 2026-09-22 00:49:15 UTC
Red Hat Product Errata RHSA-2026:69715 0 None None None 2026-09-22 01:03:46 UTC
Red Hat Product Errata RHSA-2026:69716 0 None None None 2026-09-22 02:21:47 UTC
Red Hat Product Errata RHSA-2026:69717 0 None None None 2026-09-22 01:24:33 UTC
Red Hat Product Errata RHSA-2026:69718 0 None None None 2026-09-22 01:37:12 UTC
Red Hat Product Errata RHSA-2026:69719 0 None None None 2026-09-22 01:18:21 UTC
Red Hat Product Errata RHSA-2026:69720 0 None None None 2026-09-22 01:37:59 UTC
Red Hat Product Errata RHSA-2026:75581 0 None None None 2026-10-05 04:10:41 UTC
Red Hat Product Errata RHSA-2026:77369 0 None None None 2026-10-07 13:06:55 UTC
Red Hat Product Errata RHSA-2026:79177 0 None None None 2026-10-08 14:06:02 UTC
Red Hat Product Errata RHSA-2026:97861 0 None None None 2026-11-10 22:13:23 UTC

Description OSIDB Bzimport 2026-08-21 16:33:11 UTC 
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.
Comment 3 Jon Orris 2026-09-22 00:43:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:69712 https://access.redhat.com/errata/RHSA-2026:69712
Comment 4 Jon Orris 2026-09-22 00:49:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:69713 https://access.redhat.com/errata/RHSA-2026:69713
Comment 5 Jon Orris 2026-09-22 01:03:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:69715 https://access.redhat.com/errata/RHSA-2026:69715
Comment 6 Jon Orris 2026-09-22 01:18:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:69719 https://access.redhat.com/errata/RHSA-2026:69719
Comment 7 Jon Orris 2026-09-22 01:24:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:69717 https://access.redhat.com/errata/RHSA-2026:69717
Comment 8 Jon Orris 2026-09-22 01:37:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:69718 https://access.redhat.com/errata/RHSA-2026:69718
Comment 9 Jon Orris 2026-09-22 01:37:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:69720 https://access.redhat.com/errata/RHSA-2026:69720
Comment 10 Jon Orris 2026-09-22 02:21:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:69716 https://access.redhat.com/errata/RHSA-2026:69716
Comment 11 Jon Orris 2026-10-05 04:10:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:75581 https://access.redhat.com/errata/RHSA-2026:75581
Comment 12 Jon Orris 2026-10-07 13:06:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:77369 https://access.redhat.com/errata/RHSA-2026:77369
Comment 13 Jon Orris 2026-10-08 14:06:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:79177 https://access.redhat.com/errata/RHSA-2026:79177
Comment 15 errata-xmlrpc 2026-11-10 22:13:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:97861 https://access.redhat.com/errata/RHSA-2026:97861
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