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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

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.

CVE-2026-18663 MEDIUM
5.9 Aug 12

Heap corruption via double-free in 389-ds-base's LDAP control parsing allows an unauthenticated remote attacker to crash

CVE-2026-4631 CRITICAL POC
9.8 Apr 07

Remote code execution in Cockpit's web interface allows unauthenticated attackers to execute arbitrary commands on the h

CVE-2026-4480 CRITICAL POC
9.0 May 26

Remote code execution in Samba's printing subsystem allows remote attackers to inject arbitrary shell commands via craft

CVE-2026-18922 CRITICAL
9.8 Sep 07

Authentication bypass in 389 Directory Server (shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) lets remo

CVE-2026-14544 CRITICAL
9.8 Jul 03

Remote code execution and privilege escalation in HPLIP (HP Linux Imaging and Printing) affects the hpcups print filter

CVE-2026-76578 CRITICAL
9.8 Sep 07

Unauthenticated privilege escalation in FreeIPA (Red Hat Identity Management) allows a remote attacker to gain genuine a

CVE-2026-5121 HIGH
7.5 Mar 30

Remote code execution in libarchive on 32-bit systems allows unauthenticated attackers to execute arbitrary code via spe

CVE-2026-28369 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow (the embedded web server underpinning JBoss EAP, Red Hat Data Grid, and Apache Camel

CVE-2026-28368 CRITICAL
9.1 Mar 27

HTTP request smuggling in Red Hat Undertow allows remote unauthenticated attackers to bypass front-end security controls

CVE-2026-33845 CRITICAL
9.1 Apr 30

Out-of-bounds read in the GnuTLS DTLS handshake reassembly logic lets remote unauthenticated attackers trigger an intege

CVE-2026-28367 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow allows remote unauthenticated attackers to send `\r\r\r` as a header block terminator

CVE-2026-16526 HIGH
8.8 Jul 30

Local privilege escalation in Performance Co-Pilot (PCP) on Red Hat Enterprise Linux 6 through 10 and OpenShift Containe

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-2026-35420 vulnerability details – vuln.today

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