Improper Validation of Specified Quantity in Input Affecting org.keycloak:keycloak-ldap-federation package, versions [26.6.0,26.6.3)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-17139473
- published3 Jun 2026
- disclosed28 May 2026
- creditSeongkuk Park
Introduced: 28 May 2026
CVE-2026-9801 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-ldap-federation to version 26.6.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Specified Quantity in Input in the LDAP federation BER decoder. An attacker can cause the Java Virtual Machine to terminate and disrupt service availability by sending a malformed LDAP password-policy response during authentication. This is only exploitable if the LDAP user-storage provider is configured and the attacker has high privileges, such as a realm administrator or access to a compromised LDAP server.