CVE-2026-11611
published 2026-06-08CVE-2026-11611: A flaw was found in 389 Directory Server. The Content Synchronization persistent search plugin allows unbounded memory growth when an authenticated client…
PriorityP334medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.24%
15.5th percentile
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.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| port389 | 389-ds-base | — | — |
| redhat-ds_11 | 389-ds-base | — | — |
| redhat-ds_12 | 389-ds-base | — | — |
| redhat | directory_server | — | — |
| redhat | directory_server | — | — |
| redhat | directory_server | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
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Red Hat
389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions
vendor_redhat·2026-04-16·CVSS 6.5
CVE-2026-11611 [MEDIUM] CWE-400 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions
389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions
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.
Mitigation: Bug 1 (Queue DoS): Reduce SYNC_MAX_CONCURRENT from the default of 10 to minimize the number of clients that can accumulate queues. Apply network-level rate limiting on persistent sync search requests. Monitor client connections and terminate stalled sync clients that stop reading for an extended period. Set system-level memory limits (e.g., LimitAS= in the systemd unit
GHSA
A flaw was found in 389 Directory Server.
ghsa_unreviewed·2026-06-08
CVE-2026-11611 [MEDIUM] CWE-400 A flaw was found in 389 Directory Server.
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.
VulDB
Red Hat Directory Server/Enterprise Linux 389 Directory Server resource consumption
vuldb·2026-06-08·CVSS 6.5
CVE-2026-11611 [MEDIUM] Red Hat Directory Server/Enterprise Linux 389 Directory Server resource consumption
A vulnerability was found in Red Hat Directory Server and Enterprise Linux. It has been classified as problematic. This affects an unknown part of the component 389 Directory Server. This manipulation causes resource consumption.
This vulnerability appears as CVE-2026-11611. The attack may be initiated remotely. There is no available exploit.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-11611 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions [fedora-all]
bugzilla·2026-06-30·CVSS 6.5
CVE-2026-11611 [MEDIUM] CVE-2026-11611 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions [fedora-all]
CVE-2026-11611 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The Content Synchronization (syncrepl) persistent search plugin in 389 Directory Server contains three availability bugs in sync_persist.c:
Bug 1 (primary): Unbounded queue growth — an authenticated user opens a persistent sync search then stops reading responses; modification events queue without limit until memory exhaustion and server crash. Confirmed on UBI 8 and CentOS Stream 8 production binaries (+17MB measured from 500 mods).
Bug 2: sync_persi
Bugzilla
CVE-2026-11611 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions
bugzilla·2026-06-05·CVSS 6.5
CVE-2026-11611 [MEDIUM] CVE-2026-11611 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions
CVE-2026-11611 389-ds-base: 389-ds-base: Content Sync plugin unbounded queue growth and race conditions
The Content Synchronization (syncrepl) persistent search plugin in 389 Directory Server contains three availability bugs in sync_persist.c:
Bug 1 (primary): Unbounded queue growth — an authenticated user opens a persistent sync search then stops reading responses; modification events queue without limit until memory exhaustion and server crash. Confirmed on UBI 8 and CentOS Stream 8 production binaries (+17MB measured from 500 mods).
Bug 2: sync_persist_terminate() dangling pointer race during connection teardown.
Bug 3: thread_count non-atomic increment/decrement during shutdown (weak memory model architectures).
Vulnerable code present since plugin introduction; no upstream fix as
2026-06-08
Published