CVE-2026-18453

A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.

Credits

Red Hat would like to thank Arthur Chan (Ada Logics) and Team (Anthropic) for reporting this issue.

References