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389 Directory Server EUVDEUVD-2026-35129

| CVE-2026-11611 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-06-08 redhat GHSA-m7g9-hmx3-c8f9
Denial Of Service 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
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:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

2
Analysis Generated
Jun 08, 2026 - 17:27 vuln.today
CVE Published
Jun 08, 2026 - 16:17 nvd
MEDIUM 6.5

DescriptionCVE.org

A flaw was found in 389 Directory Server. The Content Synchronization persistent search plugin allows unbounded memory growth when an authenticated client stops reading sync responses, enabling denial of service. Additional race conditions in plugin thread lifecycle can cause crashes during connection teardown or shutdown.

AnalysisAI

Denial of service in Red Hat 389 Directory Server's Content Synchronization persistent search plugin enables authenticated network clients to exhaust server memory by initiating a sync operation and halting consumption of responses, causing unbounded queue growth until the server becomes unavailable. Compounding this, race conditions in the plugin's thread lifecycle management can independently trigger server crashes during connection teardown or graceful shutdown. Affected across Red Hat Directory Server 11, 12, and 13 as well as the bundled 389-ds-base package on RHEL 6 through 10. No public exploit identified at time of analysis and no CISA KEV listing.

Technical ContextAI

389 Directory Server implements the LDAP Content Synchronization Operation (RFC 4533), exposed via a persistent search plugin that allows clients to receive streaming updates when directory entries change. CWE-400 (Uncontrolled Resource Consumption) applies here: the plugin accumulates pending sync response messages in an unbounded in-process buffer or queue without enforcing flow control or back-pressure when a connected client stalls or stops reading. This creates a slow-drain memory exhaustion path that does not require high-volume traffic - a single authenticated, idle connection is sufficient to drive memory toward OOM. The secondary defect involves thread lifecycle race conditions: when a connection is torn down or the server shuts down, concurrent plugin thread activity can access freed or transitional state, resulting in crashes rather than clean termination. Both defects are internal to the 389-ds-base daemon, affecting all deployments shipping this plugin. CPE data confirms scope across cpe:2.3:a:red_hat:red_hat_directory_server_11, _12, and _13, as well as the directory server component bundled with RHEL 6 through 10.

RemediationAI

Monitor Red Hat errata at https://access.redhat.com/security/cve/CVE-2026-11611 and apply the Red Hat-provided update for 389-ds-base or Red Hat Directory Server as soon as it becomes available - no exact fixed version number is confirmed in currently available data. For RHEL systems, use 'dnf update 389-ds-base' once errata is published. As a compensating control prior to patching, restrict LDAP persistent search access by applying LDAP ACIs that limit which accounts can issue persistent search operations (using 'aci' attributes in the cn=config or target suffix entries), accepting the trade-off that legitimate sync clients such as replication consumers or directory-aware applications may be disrupted. Alternatively, if Content Synchronization is not actively used in the environment, consider disabling the syncrepl/content-sync plugin via the 389 DS plugin configuration (cn=Content Synchronization,cn=plugins,cn=config), though this will break any LDAP sync consumers relying on RFC 4533. Enforce connection quotas and timeout policies via nsslapd-idletimeout and nsslapd-ioblocktimeout in cn=config to bound the duration of stalled client connections, which reduces but does not eliminate the memory growth window. No patch version has been independently confirmed from the referenced advisories at time of analysis.

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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-2026-35129 vulnerability details – vuln.today
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