RHSA-2026:69717
Vulnerability from csaf_redhat - Published: 2026-09-22 02:07 - Updated: 2026-09-22 04:18Summary
Red Hat Security Advisory: mod_auth_openidc:2.3 security update
Severity
Important
Notes
Topic: An update for the mod_auth_openidc:2.3 module is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in mod_auth_openidc, an OpenID Connect Relying Party module for Apache HTTP servers. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP request with a malformed state cookie. This can lead to an out-of-bounds read and a one-byte out-of-bounds write during state cookie parsing, primarily resulting in a Denial of Service (DoS) for the affected server.
7.5 (High)
Affected products
Fixed
25 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.src::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-debuginfo-0:0.6.1-3.module+el8.8.0+19464+578f4546.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-debuginfo-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-debugsource-0:0.6.1-3.module+el8.8.0+19464+578f4546.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-debugsource-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-devel-0:0.6.1-3.module+el8.8.0+19464+578f4546.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:cjose-devel-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.src::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-debuginfo-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-debuginfo-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-debugsource-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.ppc64le::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.E4S:mod_auth_openidc-debugsource-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.src::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:cjose-debuginfo-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:cjose-debugsource-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:cjose-devel-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.src::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:mod_auth_openidc-debuginfo-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.8.0.Z.TUS:mod_auth_openidc-debugsource-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
10 references
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"name": "Out-of-bounds Read"
},
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"ids": [
{
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"text": "2521051"
}
],
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{
"category": "description",
"text": "A flaw was found in mod_auth_openidc, an OpenID Connect Relying Party module for Apache HTTP servers. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP request with a malformed state cookie. This can lead to an out-of-bounds read and a one-byte out-of-bounds write during state cookie parsing, primarily resulting in a Denial of Service (DoS) for the affected server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw in `mod_auth_openidc`. The vulnerability arises from an out-of-bounds read and write in the state-cookie parser when processing specially crafted `Cookie` headers. Exploitation could lead to service unavailability for systems configured with `mod_auth_openidc` for OpenID Connect Relying Party functionality.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-54789"
},
{
"category": "external",
"summary": "RHBZ#2521051",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521051"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-54789",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54789"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-54789",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54789"
},
{
"category": "external",
"summary": "https://github.com/OpenIDC/mod_auth_openidc/commit/8017478471cc071c49aa073c5c9be652a73a8630",
"url": "https://github.com/OpenIDC/mod_auth_openidc/commit/8017478471cc071c49aa073c5c9be652a73a8630"
},
{
"category": "external",
"summary": "https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-vgr5-qcpp-x2pr",
"url": "https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-vgr5-qcpp-x2pr"
}
],
"release_date": "2026-08-21T16:13:23.073000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T02:07:12+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"AppStream-8.8.0.Z.E4S:mod_auth_openidc-debuginfo-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.E4S:mod_auth_openidc-debugsource-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.ppc64le::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.E4S:mod_auth_openidc-debugsource-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.src::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:cjose-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:cjose-debuginfo-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:cjose-debugsource-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:cjose-devel-0:0.6.1-3.module+el8.8.0+19464+578f4546.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.src::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:mod_auth_openidc-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:mod_auth_openidc-debuginfo-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3",
"AppStream-8.8.0.Z.TUS:mod_auth_openidc-debugsource-0:2.4.9.4-1.module+el8.8.0+24885+7d8e9f68.3.x86_64::mod_auth_openidc:2.3"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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