Skip to main content

389 Directory Server CVE-2026-11788

| EUVDEUVD-2026-35420 HIGH
NULL Pointer Dereference (CWE-476)
2026-06-09 redhat GHSA-x2wj-4r98-4867
Denial Of Service Null Pointer Dereference Red Hat Directory Server 11 Red Hat Directory Server 12 Red Hat Directory Server 13 Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9
7.5
CVSS 3.1 · NVD
Share

Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.9 MEDIUM

Network-reachable and unauthenticated, but exploitation depends on inducing a memory-allocation failure in the server, so AC:H; impact is availability-only crash of ns-slapd.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.9 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

10
Analysis Updated
Jun 12, 2026 - 18:43 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 12, 2026 - 18:43 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 12, 2026 - 18:37 vuln.today
cvss_changed
Severity Changed
Jun 12, 2026 - 18:37 NVD
MEDIUM HIGH
CVSS changed
Jun 12, 2026 - 18:37 NVD
5.9 (MEDIUM) 7.5 (HIGH)
Re-analysis Queued
Jun 12, 2026 - 18:37 vuln.today
cvss_changed
Severity Changed
Jun 12, 2026 - 18:37 NVD
MEDIUM HIGH
CVSS changed
Jun 12, 2026 - 18:37 NVD
5.9 (MEDIUM) 7.5 (HIGH)
Analysis Generated
Jun 09, 2026 - 13:52 vuln.today
CVE Published
Jun 09, 2026 - 13:02 nvd
MEDIUM 5.9

DescriptionNVD

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.

AnalysisAI

Remote denial of service in 389 Directory Server (Red Hat Directory Server 11/12/13 and Red Hat Enterprise Linux 6 through 10) allows unauthenticated network attackers to crash the LDAP daemon by exploiting an unchecked BER structure allocation in the dereference control plugin when the host is under memory pressure. No public exploit identified at time of analysis, and EPSS exploitation probability is very low (0.09%, 25th percentile), but the unauthenticated network-reachable nature warrants prompt patching of internet-facing or business-critical directory services.

Technical ContextAI

389 Directory Server is the upstream open-source LDAP/directory implementation shipped by Red Hat as Red Hat Directory Server and bundled into RHEL. The dereference control is an LDAP v3 control (OID 1.3.6.1.4.1.4203.666.5.16) that lets clients request the server resolve DN-valued attributes during a search; the server uses ASN.1 BER (Basic Encoding Rules) structures from libldap/OpenLDAP to parse and build these control payloads. The root cause is CWE-476 NULL Pointer Dereference: when memory allocation for the BER structure fails (e.g., under memory pressure), the plugin does not check the returned pointer and proceeds to dereference it, causing the ns-slapd process to segfault and terminate the LDAP service.

RemediationAI

Patch available per vendor advisory - apply the Red Hat-provided 389-ds-base / redhat-ds package update for your platform once the corresponding RHSA is published (track https://access.redhat.com/security/cve/CVE-2026-11788 and Bugzilla 2485423 for the exact fixed version, which was not included in the input data). As a compensating control until patched, restrict LDAP (389/tcp) and LDAPS (636/tcp) network access to known client subnets via host or perimeter firewall, which limits the attack surface but breaks any directory client outside the allowlist. You can also disable the dereference control plugin in dse.ldif (nsslapd-pluginEnabled: off for the deref plugin) to remove the vulnerable code path; the trade-off is that any application relying on the LDAP dereference control will lose that functionality. Finally, ensure adequate memory headroom and monitoring on directory hosts, since the bug only triggers under allocation failure - sustained free memory materially reduces realistic exploitability.

More in Red Hat Directory Server 11

View all
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-2026-15722 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-2026-11884 MEDIUM
6.5 Jun 10

Heap buffer overflow in Red Hat 389 Directory Server allows an authenticated Directory Manager or a compromised replicat
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

Same weakness CWE-476 – NULL Pointer Dereference

View all
CVE-2016-0742 HIGH
7.5
CVE-2014-3470 MEDIUM
4.3
CVE-2017-3730 HIGH POC
7.5
CVE-2017-3169 CRITICAL POC
9.8
CVE-2016-4957 HIGH
7.5
CVE-2015-3194 HIGH
7.5
CVE-2026-21525 MEDIUM
6.2
CVE-2017-0016 MEDIUM
5.9

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

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

Share

CVE-2026-11788 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy