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389 Directory Server CVE-2026-11791

| EUVDEUVD-2026-37902 MEDIUM
Use After Free (CWE-416)
2026-06-18 redhat GHSA-gxp7-cx54-gr2m
Use After Free Memory Corruption Denial Of Service 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
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

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain Directory Manager credentials
Delivery
Authenticate to 389 Directory Server
Exploit
Issue schema reload while LDAP query traffic is active
Execution
attr_syntax_swap_ht() frees syntax nodes without refcount check
Persist
Worker thread dereferences freed memory
Impact
Server crash and denial of service
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Vulnerability AssessmentAI

Exploitation Exploitation requires two simultaneous conditions: (1) the attacker or insider holds administrator-level (Directory Manager) credentials sufficient to invoke a schema reload operation - this is the PR:H gating factor that prevents unauthenticated or low-privileged exploitation entirely; and (2) concurrent LDAP query traffic from other clients must be active at the moment of the schema reload, creating the race condition - this is the AC:H factor. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H) yields a 5.0 score that accurately reflects the constrained exploitation path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A threat actor who has obtained Directory Manager credentials - either through credential theft, insider access, or a prior compromise - authenticates to the 389 Directory Server and issues a schema reload operation (e.g., via ldapmodify targeting cn=schema) while the server is under normal LDAP query load from applications. The race between `attr_syntax_swap_ht()` freeing syntax nodes and concurrent worker threads dereferencing those same nodes causes a use-after-free, crashing the directory server process and interrupting all LDAP-dependent services (authentication, authorization, application logins). …
Remediation 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. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-416 – Use After Free

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CVE-2019-0708 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2012-4792 HIGH POC
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CVE-2009-4324 HIGH POC
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CVE-2015-0313 CRITICAL POC
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CVE-2015-5122 CRITICAL POC
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Same technique Use After Free

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8
CVE-2012-4969 HIGH POC
8.1

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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CVE-2026-11791 vulnerability details – vuln.today
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