Out-of-bounds Read Affecting keycloak-25 package, versions <25.0.6+e1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.72% (52nd percentile)

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  • Snyk IDSNYK-ECHOLATEST-KEYCLOAK25-19435064
  • published31 Aug 2026
  • disclosed28 May 2026

Introduced: 28 May 2026

CVE-2026-9803  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Echo:latest keycloak-25 to version 25.0.6+e1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream keycloak-25 package and not the keycloak-25 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1