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CVE-2026-11611 Red Hat CVE debrief

CVE-2026-11611 is a medium-severity vulnerability 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.

Vendor
Red Hat
Product
Red Hat Directory Server 11
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Users of 389 Directory Server should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The Content Synchronization persistent search plugin in 389 Directory Server 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.

Defensive priority

medium

Recommended defensive actions

  • Apply patches or updates from the vendor as they become available.
  • Restrict access to the 389 Directory Server to only trusted clients and users.
  • Monitor server resources and logs for signs of memory growth or crashes.

Evidence notes

Vendor: Unknown Vendor (confidence: low). Evidence suggests the vendor may be Redhat.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11611 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11611

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11611 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11611

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.