CVE-2026-78701

In 389-ds-base, the server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS. An on-path attacker can inject a crafted LDAP message that is processed after the TLS upgrade, and the response is delivered to the client instead of the client's own pending operation's response.

389-ds-base versions before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

A flaw was found 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, causing the server to hand that connection to a second worker thread before the first worker's result is flushed. The second worker blocks until nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. Repeating this across a small number of connections proportional to the configured worker-thread pool size exhausts the entire pool under default configuration, denying service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the attacker maintains the connections.

A flaw in 389-ds-base, in the Cockpit 389 Console's LDAP editor. An LDAP entry's DN is embedded into a shell command without proper escaping. A user with delegated privileges could craft a malicious DN with shell metacharacters, leading to command execution with root privileges when viewed by an administrator.

A double-free flaw was found in 389-ds-base in the get_ldapmessage_controls_ext() function. An unauthenticated remote attacker can trigger it with a single BIND request carrying a critical Session Tracking control, leading to heap corruption and potential denial of service.

A heap-buffer-overflow flaw was found in Directory Server (389-ds-base). When a DN contains a legacy-quoted value, the server won't close the heap allocation allowing another call to refer to the same memory pointer causing a denial of service or an arbitrary memory write operation.

A flaw was found in 389-ds-base where the LDBM backend attribute encryption uses a hardcoded static initialization vector for AES-CBC and 3DES-CBC operations, allowing an attacker with privileged filesystem access to detect plaintext equality across encrypted entries by comparing ciphertext blocks.

A heap-buffer-overflow vulnerability was found in 389 Directory Server (389-ds-base). When normalizing a Distinguished Name (DN) that contains a legacy-quoted value encoding a multivalued nested Relative Distinguished Name (RDN), the server can write past the end of a heap allocation while sorting RDN attribute-value pairs. An unauthenticated remote attacker can trigger this condition by sending an LDAP operation whose DN reaches the DN normalization routine, such as a search with a crafted base DN.

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). An authenticated attacker can send a specially crafted oversized LDAP UNBIND packet that overflows a 512-byte heap receive buffer without bounds checking, causing a denial of service (server crash).

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). Adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data.