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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
2026-06-12
Advisory published
2026-06-09
Advisory updated
2026-06-12

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].

Official resources

CVE-2026-11788 was published on 2026-06-09T14:16:36.940Z and modified on 2026-06-12T18:30:45.040Z.