Medium [CVE-2026-11611] 389-ds-base: 389-ds-base: content sync plugin unbounded queue growth and race conditions
This medium-severity Red Hat Linux advisory covers CVE-2026-11611 affecting Red Hat Directory Server 11, Red Hat Directory Server 12, Red Hat Directory Server 13.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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. Red Hat rates this issue as Moderate impact.
Any authenticated user with search ACL access can trigger the primary denial-of-service path. These secondary paths have no configuration workaround.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-400.
Affected Red Hat products: Red Hat Directory Server 11; Red Hat Directory Server 12; Red Hat Directory Server 13; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat lists Red Hat Enterprise Linux 6 as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: 389-ds-base.
Is CVE-2026-11611 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-11611 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-11611?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- 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 file or cgroup memory limits) to prevent unbounded memory growth. Bugs 2 and 3: No workaround available — these are code-level race conditions that require source fixes.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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