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389 Directory Server EUVDEUVD-2026-36045

| CVE-2026-11884 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-06-10 redhat GHSA-f4g5-r76v-qg3p
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jun 10, 2026 - 15:31 vuln.today
CVE Published
Jun 10, 2026 - 14:07 nvd
MEDIUM 6.5

DescriptionCVE.org

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.

AnalysisAI

Heap buffer overflow in Red Hat 389 Directory Server allows an authenticated Directory Manager or a compromised replication supplier to crash the server or corrupt heap memory by creating objectclass definitions with excessively long SUP (oc_superior) values. The flaw exists in schema serialization functions where the SUP field length is excluded from buffer size calculations yet still written via strcat(), producing an off-by-N heap overwrite. This is explicitly an incomplete fix variant of CVE-2025-14905, meaning organizations that patched that prior CVE may remain exposed if the SUP field code path was not remediated; no public exploit has been identified at time of analysis.

Technical ContextAI

389 Directory Server is Red Hat's enterprise LDAP implementation, shipped as a standalone product (Red Hat Directory Server 11, 12, 13) and embedded in RHEL 6 through 10. The vulnerable code resides in read_schema_dse() and schema_oc_to_string(), two functions responsible for serializing objectclass schema definitions from the DSE (Directory Server Entry) into string form. When constructing the output buffer, the code omits the byte length of the oc_superior (SUP) field - which holds the name of the parent objectclass - from the initial malloc/realloc size calculation, but then appends the field unconditionally using strcat(). This classic CWE-122 (Heap-based Buffer Overflow) pattern means any SUP value long enough to exceed the unaccounted slack will write past the allocated heap region. The relationship to CVE-2025-14905 indicates the original fix addressed other fields in the same serialization routine but left the SUP path unguarded, a partial-patch pattern that is frequently exploitable once the root cause is publicly documented.

RemediationAI

No specific fixed package version is confirmed in the available data; monitor https://access.redhat.com/security/cve/CVE-2026-11884 and the Bugzilla tracker at https://bugzilla.redhat.com/show_bug.cgi?id=2484913 for errata publication. Because this is an incomplete fix of CVE-2025-14905, when a patch becomes available verify through release notes or the Bugzilla entry that it explicitly addresses the oc_superior (SUP) field in both read_schema_dse() and schema_oc_to_string() - applying a patch that only covers the original CVE-2025-14905 code path will not remediate this variant. As compensating controls prior to patching: restrict the Directory Manager bind DN and any accounts with schema write ACIs to the minimum operationally required set, and audit current privilege grants using the directory's ACI configuration; rotate Directory Manager credentials if there is any suspicion of compromise, as credential theft is the primary realistic enabler. Harden replication topology by reviewing all configured replication supplier agreements and removing any suppliers that are no longer operationally required, since a compromised supplier represents a second trigger path that bypasses normal credential controls. Placing the LDAP service behind network controls that restrict administrative port access (typically 636/389) to known management hosts reduces the effective network attack surface, though this does not eliminate risk from already-privileged insiders.

CVE-2026-11610 HIGH
8.8 Jul 07

Denial of service in Red Hat / 389 Directory Server (389-ds-base, versions since ~1.3.2/2013) allows an authenticated LD

CVE-2026-11774 HIGH
7.6 Jun 11

Heap buffer overflow in 389 Directory Server (389-ds-base) SASL I/O layer allows authenticated remote attackers to crash

CVE-2026-11770 HIGH
7.5 Jul 31

Information disclosure in 389 Directory Server (upstream of Red Hat Directory Server 11-13, shipped across RHEL 6-10) le

CVE-2026-11788 HIGH
7.5 Jun 09

Remote denial of service in 389 Directory Server (Red Hat Directory Server 11/12/13 and Red Hat Enterprise Linux 6 throu

CVE-2026-15722 HIGH
7.5 Jul 31

Remote unauthenticated denial of service in 389 Directory Server (389-ds-base, shipped as Red Hat Directory Server 11-13

CVE-2026-11789 MEDIUM
6.5 Jun 09

Denial-of-service in Red Hat's 389 Directory Server allows a highly privileged network attacker to crash the LDAP servic

CVE-2026-11611 MEDIUM
6.5 Jun 08

Denial of service in Red Hat 389 Directory Server's Content Synchronization persistent search plugin enables authenticat

CVE-2026-11786 MEDIUM
6.5 Jun 09

Out-of-bounds read in 389 Directory Server's LDIF parser exposes limited heap memory to a highly privileged local attack

CVE-2026-11787 MEDIUM
6.3 Jun 09

Heap buffer over-read in Red Hat Directory Server's ldap_utf8prev() function exposes LDAP deployments to potential confi

CVE-2026-12528 MEDIUM
5.4 Jun 17

Heap buffer overflow in 389 Directory Server's ACI parsing layer allows an authenticated LDAP user with write access to

CVE-2026-14940 MEDIUM
5.3 Jul 07

Heap-buffer-overflow in 389 Directory Server's DN normalization routine allows an unauthenticated remote attacker to cor

CVE-2026-16560 MEDIUM
5.3 Jul 22

Heap buffer overflow in Red Hat Directory Server (389-ds-base) exposes LDAP services to remote unauthenticated denial of

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Server 16.1 Affected

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EUVD-2026-36045 vulnerability details – vuln.today

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