Out-of-bounds Read Affecting org.keycloak:keycloak-services package, versions [9.0.0,26.6.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGKEYCLOAK-17082663
- published29 May 2026
- disclosed28 May 2026
- creditUnknown
Introduced: 28 May 2026
CVE-2026-9803 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-services to version 26.6.3 or higher.
Overview
org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services.
Affected versions of this package are vulnerable to Out-of-bounds Read via the authorization header parsing in the ClientRegistrationAuth component. An attacker can cause a temporary disruption of service by sending a specially crafted request with a malformed 'Authorization: Bearer' header, which triggers an ArrayIndexOutOfBoundsException and results in an HTTP 500 error.