CVE-2026-103877: org.apache.directory.api/api-ldap-client-api: Apache Directory LDAP API: Remote code execution via untrusted Java object deserialization

Severity: Critical

CVSS Score: 9.8

Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API. A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java class, allowing some potential RCE.  This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9. Users are recommended to upgrade to version 2.1.9, which fixes the issue.