NULL pointer dereference in Red Hat Directory Server 11
CVE-2026-11788
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Red Hat Directory Server 11
- Red Hat Directory Server 11.9 For Rhel 8 — versions 8100020260803140625.37ed7c03
- Red Hat Directory Server 12
- Red Hat Directory Server 13
- Red Hat Enterprise Linux 10 — versions 0:3.2.0-9.el10_2
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:3.0.6-20.el10_0
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:1.3.11.1-14.el7_9
- Red Hat Enterprise Linux 8 — versions 8100020260806150504.25e700aa
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-11788 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- redhat.atlassian.net/browse/PSIRTSUPT-7600 (Permissions Required)
- access.redhat.com/errata/RHSA-2026:55421 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55422 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55425 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55426 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55423 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55424 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:55532 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-11788?
- CVE-2026-11788 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2026-06-09.
- How severe is CVE-2026-11788?
- Medium severity. CVSS v3 base score is 5.9 out of 10.