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Keycloak: keycloak: denial of service via malformed authorization header (Red Hat Red Hat build of Keycloak 26.4)

CVE-2026-9803
MEDIUM 5.3

En bref

Source
NVD
EPSS
EPSS 0.42 % · centile 36 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
redhat
Statut NVD
Modified

Rechercher sur…

Description

A flaw was found in Keycloak's ClientRegistrationAuth component. A remote unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with a malformed 'Authorization: Bearer' header to any client registration endpoint. This can lead to an ArrayIndexOutOfBoundsException, causing the server to return an HTTP 500 error and resulting in a Denial of Service (DoS) for the affected service.

Faiblesses (CWE)

  • CWE-125 — Lecture hors limites

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lredhat
CVSS 3.1MEDIUM 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LNVD · secalert@redhat.com (Secondary)

Avis

Références européennes

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Red Hat · Red Hat build of Keycloak 26.4unaffected 26.4.13-1 < *
Red Hat · Red Hat build of Keycloak 26.4unaffected 26.4-19 < *
Red Hat · Red Hat build of Keycloak 26.4unaffected 26.4-19 < *
Red Hat · Red Hat build of Keycloak 26.4.13
Red Hat · Red Hat build of Keycloak 26.6unaffected 26.6.3-3 < *
Red Hat · Red Hat build of Keycloak 26.6unaffected 26.6-6 < *
Red Hat · Red Hat build of Keycloak 26.6unaffected 26.6-6 < *
Red Hat · Red Hat build of Keycloak 26.6.3

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD