Red Hat 389 Directory Server vulnerabilities

CVE-2026-18651 Medium · 5.4 CWE-287 Aug 3, 2026

Improper Authentication in Red Hat Directory Server

A flaw was found in 389 Directory Server. During SASL PLAIN authentication, the server installs connection-level bind credentials before performing the account-lock check. If the account is subsequently found to be locked, the bind is reported as failed to the client, but the already-installed authenticated state on the connection is not reverted. A client that supplies valid credentials for an account that has been administratively locked can continue to use the same connection with that account's privileges, defeating account lock as an access-revocation control.

CVE-2026-15722 High · 7.5 CWE-121 Jul 31, 2026

389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsing

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to denial of service.

CVE-2026-11770 High · 7.5 CWE-90 Jul 31, 2026

389-ds-base: 389-ds-base: pre-auth ldap filter injection in cleanallruv status check

A flaw was found in 389 Directory Server. An unauthenticated remote attacker can inject LDAP search filters into the CleanAllRUV replication status-check extended operation. Because the handler performs the search against cn=config with elevated replication plugin privileges and returns a boolean match result, the attacker can extract sensitive server configuration metadata, including replication bind DNs and password storage scheme information.

CVE-2026-15041 Low · 3.7 CWE-208 Jul 8, 2026

389-ds-base: 389-ds-base: non-constant-time comparison in pbkdf2-sha256 password verification

A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password verification function uses standard memcmp() for comparing password hashes instead of a constant-time comparison function. A remote attacker could potentially use timing measurements of LDAP bind attempts to infer partial hash information, though practical exploitation is extremely difficult due to PBKDF2 computational overhead.

CVE-2026-14969 Medium · 4.4 CWE-329 Jul 7, 2026

389-ds-base: 389-ds-base: static initialization vector in aes-cbc/3des-cbc attribute encryption

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.

CVE-2026-14940 Medium · 5.3 CWE-122 Jul 7, 2026

389-ds-base: 389-ds-base: heap-buffer-overflow in dn normalization via quoted multivalued rdn

A heap-buffer-overflow flaw 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. This can corrupt heap memory and may cause denial of service.

CVE-2026-11791 Medium · 5.0 CWE-416 Jun 18, 2026

389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()

A flaw was found in 389 Directory Server. During schema reload, the attr_syntax_swap_ht() function unconditionally frees attribute syntax information nodes, bypassing the refcount-based deferred deletion used elsewhere in the attribute syntax subsystem. If an administrator triggers schema reload while concurrent LDAP query traffic is active, worker threads may access freed memory, resulting in use-after-free or double-free and a denial of service (server crash).

CVE-2026-12528 Medium · 5.4 CWE-787 Jun 17, 2026

389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__normalize_acltxt()

A flaw was found in 389 Directory Server in the __aclp__normalize_acltxt() function of aclparse.c. A malformed ACI (Access Control Instruction) string can trigger heap-buffer-overflow writes and reads during ACI parsing. The function fails to validate that the ACI keyword has sufficient length after whitespace stripping, leading to a 1-byte out-of-bounds write and subsequent out-of-bounds reads. An authenticated user with write access to the aci attribute could send a crafted ACI value to silently corrupt heap memory in the directory server process.

CVE-2026-11793 Medium · 4.9 CWE-121 Jun 9, 2026

389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing

A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.

CVE-2026-11790 Medium · 4.9 CWE-400 Jun 9, 2026

389-ds-base: 389-ds-base: pbkdf2 password storage plugin unbounded iteration count denial of service

A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password storage plugin does not enforce an upper bound on the iteration count extracted from stored password hashes. A privileged attacker who can modify a user's password hash can cause excessive CPU consumption during authentication, resulting in denial of service.

CVE-2026-11789 Medium · 6.5 CWE-191 Jun 9, 2026

389-ds-base: 389-ds-base: smd5 password storage plugin salt length integer underflow crash

A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.

CVE-2026-11787 Medium · 6.3 CWE-126 Jun 9, 2026

389-ds-base: 389-ds-base: heap buffer over-read in ldap_utf8prev() via str2simple filter parsing

A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.

CVE-2026-11786 Medium · 6.5 CWE-125 Jun 9, 2026

389-ds-base: 389-ds-base: heap out-of-bounds read in ldif parser str2entry_state_information_from_type()

A flaw was found in 389 Directory Server. The LDIF parser reads past the end of a heap buffer when processing attribute types with trailing semicolons during database import, causing an out-of-bounds read detectable under memory instrumentation.

CVE-2026-11785 Medium · 4.3 CWE-843 Jun 9, 2026

389-ds-base: 389-ds-base: partial stack address information leak via ber_printf type confusion in sso token handler

A flaw was found in 389 Directory Server. A type confusion in the SSO token extended operation handler causes partial stack address information to be disclosed in LDAP responses to authenticated users.

CVE-2026-11788 High · 7.5 CWE-476 Jun 9, 2026

389-ds-base: 389-ds-base: null pointer dereference in deref control plugin ber parser

A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.

CVE-2026-11611 Medium · 6.5 CWE-400 Jun 8, 2026

389-ds-base: 389-ds-base: content sync plugin unbounded queue growth and race conditions

A flaw was found in 389 Directory Server. The Content Synchronization persistent search plugin allows unbounded memory growth when an authenticated client stops reading sync responses, enabling denial of service. Additional race conditions in plugin thread lifecycle can cause crashes during connection teardown or shutdown.

CVE-2026-9064 High · 7.5 CWE-770 May 20, 2026

389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)

A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.