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389-ds-base

A denial-of-service vulnerability exists in 389-ds-base where an unauthenticated remote attacker can exhaust the server's worker-thread pool by sending crafted LDAP operations. This causes the server to block and deny service to all clients for the duration of the attack.

CVE-2026-86344 describes a flaw in 389-ds-base where an unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection. This causes the server to hand the connection to a second worker thread before the first worker's result is flushed. The second worker then blocks until the configured nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. By repeating this attack across a small number of connections proportional to the worker-thread pool size, the attacker exhausts the entire pool under default configuration, resulting in denial of service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the connections are maintained.

A flaw was found in 389-ds-base. (CVE-2026-86344)

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