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389 Directory Server EUVDEUVD-2026-37902

| CVE-2026-11791 MEDIUM
Use After Free (CWE-416)
2026-06-18 redhat GHSA-gxp7-cx54-gr2m
Denial Of Service Use After Free Memory Corruption 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 Red Hat Directory Server 11 Red Hat Directory Server 12 Red Hat Directory Server 13 Red Hat
5.0
CVSS 3.1 · NVD
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Severity by source

Vendor (redhat) PRIMARY
MEDIUM
qualitative
NVD
5.0 MEDIUM
AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
vuln.today AI
4.4 MEDIUM

Admin-only schema reload trigger sets PR:H; race condition with concurrent traffic sets AC:H; crash is pure availability impact with no confirmed confidentiality or integrity effect.

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

Primary rating from Vendor (redhat).

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jun 18, 2026 - 16:06 vuln.today
CVE Published
Jun 18, 2026 - 14:44 cve.org
MEDIUM 5.0

DescriptionNVD

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).

AnalysisAI

Use-after-free in 389 Directory Server's schema reload path crashes the server when administrative schema reloads race against active LDAP query worker threads. The attr_syntax_swap_ht() function bypasses the refcount-based deferred deletion mechanism used throughout the attribute syntax subsystem, directly freeing nodes that concurrent worker threads may still hold references to. Affected products span Red Hat Directory Server 11, 12, and 13 across RHEL 6 through 10; no public exploit or active exploitation (CISA KEV) has been identified at time of analysis, and the CVSS score of 5.0 reflects the high-complexity, high-privilege prerequisites that substantially reduce real-world risk.

Technical ContextAI

389 Directory Server is Red Hat's enterprise LDAP server, based on the upstream 389-ds-base project. The attribute syntax subsystem manages how directory schema attribute types are defined and interpreted; a refcount-based deferred deletion model is used to safely recycle these nodes while worker threads may still hold pointers. During a schema reload, attr_syntax_swap_ht() unconditionally frees attribute syntax information nodes without decrementing or consulting the refcount, violating the invariant that governs safe reclamation. CWE-416 (Use After Free) applies: freed heap memory is subsequently accessed by LDAP query worker threads that were mid-operation, producing undefined behavior ranging from silent corruption to an exploitable crash. CPE strings confirm affected scope: cpe:2.3:a:red_hat:red_hat_directory_server_11, _12, and _13, as well as the 389-ds-base packages shipped with RHEL 6 through 10.

RemediationAI

The primary remediation is to apply the vendor-issued patch from Red Hat once released; monitor https://access.redhat.com/security/cve/CVE-2026-11791 and the Bugzilla tracker at https://bugzilla.redhat.com/show_bug.cgi?id=2485414 for the specific fixed package versions - no exact patched version number is confirmed in available data at time of analysis. Until a patch is available, administrators can reduce risk by restricting schema reload operations to scheduled maintenance windows with zero active LDAP query traffic, effectively eliminating the race condition. This can be enforced by temporarily halting application-layer LDAP connections (e.g., blocking the LDAP/LDAPS port at the firewall or load balancer) before initiating any schema reload, then re-enabling traffic afterward; the trade-off is a brief, planned service interruption. Additionally, tightly restrict who holds Directory Manager or cn=Directory Manager credentials, since PR:H is the gating prerequisite - reducing the pool of users capable of triggering a schema reload limits exposure. Opportunistic exploitation by external attackers is structurally prevented by the authentication requirement.

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Same weakness CWE-416 – Use After Free

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Same technique Denial Of Service

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CVE-2011-2462 CRITICAL POC
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Vendor StatusVendor

SUSE

Severity: Important
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-2026-37902 vulnerability details – vuln.today
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