CVE-2026-11884
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
A heap buffer overflow vulnerability was found in 389 Directory Server. When serializing objectclass definitions, the oc_superior (SUP) field length is omitted from buffer size calculations in read_schema_dse() and schema_oc_to_string(), but the field is still written via strcat(). An attacker with Directory Manager privileges or a compromised replication supplier can trigger a server crash by creating objectclasses with long SUP values. This is an incomplete fix variant of CVE-2025-14905.
Risk Assessment
The risk involves potential server crash caused by an attacker with Directory Manager privileges or a compromised replication supplier, leading to directory service disruption and possible availability loss.
Recommendation
It is recommended to immediately apply the official vendor patch for 389 Directory Server, restrict Directory Manager privileges, and monitor replication for unauthorized changes.
Other vulnerabilities in 389 Directory Server
See all- CVE-2015-1854High
389 Directory Server before 1.3.3.10 allows attackers to bypass intended access restrictions and modify directory entries via a crafted ldapmodrdn call.
- CVE-2016-5416High
389 Directory Server in Red Hat Enterprise Linux 6 and 7 allows remote attackers to read the default Access Control Instructions.
- CVE-2016-4992High
The 389 Directory Server in Red Hat Enterprise Linux 6 and 7 allows remote attackers to infer the existence of RDN component objects.
- CVE-2016-0741High
In 389 Directory Server (formerly Fedora Directory Server) versions 1.3.4.x before 1.3.4.7, a vulnerability allows remote attackers to cause a denial of service through an abnormally closed connection, leading to an infinite loop and connection blocking.
- CVE-2015-3230High
389 Directory Server (formerly Fedora Directory Server) before version 1.3.3.12 does not enforce the nsSSL3Ciphers preference when creating an sslSocket, allowing remote attackers to use a disabled cipher.
- CVE-2016-5405Critical
The 389 Directory Server in Red Hat Enterprise Linux (Desktop, HPC Node, Server, Workstation) versions 6 and 7 allows remote attackers to obtain user passwords.
- CVE-2026-19404Medium
A flaw was found in 389 Directory Server. The CleanAllRUV and Abort CleanAllRUV replication-maintenance extended operations perform no authorization check, allowing an unauthenticated remote attacker to invoke them when nsslapd-allow-anonymous-access is enabled (the default), or any authenticated low-privilege user to invoke them otherwise. This allows removal of a replica ID from replication metadata, purging of changelog records, and interruption of administrator-initiated cleanup, which can leave replication inconsistent or unavailable.
- CVE-2026-18651Medium
389 Directory Server has a vulnerability in SASL PLAIN authentication. The server installs connection-level bind credentials before performing the account-lock check. If the account is locked, the bind is reported as failed, but the authenticated state on the connection is not reverted. A client with valid credentials for a locked account can continue to use the connection with that account's privileges.
- CVE-2026-15722High
A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base) in the get_ruvelement_from_berval() function. A remote unauthenticated attacker can send a crafted StartNSDS50ReplicationRequest with a replica ID field containing more than 16 digit characters, causing a crash of the LDAP server.
- CVE-2026-11770High
A flaw was found in 389 Directory Server where an unauthenticated remote attacker can inject LDAP search filters into the CleanAllRUV operation. Because the query runs with elevated privileges, the attacker can extract sensitive server configuration metadata, including replication bind DNs and password storage scheme information.
Original NVD description (English source)
A heap buffer overflow flaw was found in 389 Directory Server. When serializing objectclass definitions, the oc_superior (SUP) field length is omitted from buffer size calculations in read_schema_dse() and schema_oc_to_string(), but the field is still written via strcat(). An attacker with Directory Manager privileges, or a compromised replication supplier, can trigger a server crash by creating objectclasses with long SUP values. This is an incomplete fix variant of CVE-2025-14905.