> CVE-2026-54789 [HIGH]

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PUBLISHED
2026-08-21 16:17
MODIFIED
2026-08-21 16:17
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.49%
Top 58.8%
DATA SOURCES:
NVD đź”— 2026-08-21 CWE MITRE đź”— 2026-09-01 FIRST EPSS đź”— 2026-10-25 OSV đź”— 2026-08-27

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-125 CWE-787

> CWE DETAILED DESCRIPTIONS

CWE-125: Out-of-bounds Read - The product reads data past the end, or before the beginning, of the intended buffer. | CWE-787: Out-of-bounds Write - The product writes data past the end, or before the beginning, of the intended buffer.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Co...
Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Impor...
Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Impor...
Red Hat Security Advisory: mod_auth_openidc:2.3 security update
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. R...
Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A C...
Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A C...
Red Hat Security Advisory: mod_auth_openidc:2.3 security update
An update for the mod_auth_openidc:2.3 module is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-L...
Red Hat Security Advisory: mod_auth_openidc:2.3 security update
An update for the mod_auth_openidc:2.3 module is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-L...
Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scorin...
Red Hat Security Advisory: mod_auth_openidc:2.3 security update
An update for the mod_auth_openidc:2.3 module is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulner...
Red Hat Security Advisory: mod_auth_openidc security update
An update for mod_auth_openidc is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring...

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

mod_auth_openidc has out-of-bounds read and write in state cookie parsing

AFFECTED PACKAGES:
Unknown / Unknown
118 versions affected
ALIASES:
GHSA-vgr5-qcpp-x2pr

> HISTORIQUE DES MODIFICATIONS

Première apparition
21/08/2026 16:17
Source: NVD
đź“Š ENRICHISSEMENT 01/09/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-125: Out-of-bounds Read - The product reads data past the end, or before the beginning, of the intended buffer. | CWE-787: Out-of-bounds Write - The product writes data past the end, or before the...
Total des modifications: 1 Dernière mise à jour: 1 month ago

> REFERENCES

https://github.com/OpenIDC/mod_auth_openidc/commit/8017478471cc071c49aa073c5c9be...
https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-vgr5-qcpp-x...
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