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CVE-2026-11788 Red Hat CVE debrief

A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.

Vendor
Red Hat
Product
Red Hat Directory Server 11
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-08-18
Advisory published
2026-06-09
Advisory updated
2026-08-18

Who should care

Users of 389 Directory Server, particularly those with systems under memory pressure, should be aware of this vulnerability.

Technical summary

The CVE-2026-11788 vulnerability has a CVSS score of 5.9 and is classified as MEDIUM severity. It affects various versions of Red Hat Directory Server and Enterprise Linux. The vulnerability is caused by the dereference control plugin not checking for allocation failure before using a BER structure.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by the vendor to fix the vulnerability.
  • Monitor system memory pressure and LDAP server stability.
  • Consider implementing additional security measures to prevent exploitation.

Evidence notes

The vulnerability is documented in the CVE record [cve-org] and detailed in the NVD entry [nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11788 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11788

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

  • CVE-2026-11788 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11788

    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.