PT-2026-50687 · Red Hat · Red Hat Directory Server 11+7

Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-11791

NVD

CVSS v3.1

5.0

Medium

Base vector

AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

A flaw was found in 389 Directory Server. During schema reload, the attr syntax swap ht() function unconditionally frees attribute syntax information nodes, bypassing the refcount-based deferred deletion used elsewhere in the attribute syntax subsystem. If an administrator triggers schema reload while concurrent LDAP query traffic is active, worker threads may access freed memory, resulting in use-after-free or double-free and a denial of service (server crash).

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-11791

Affected 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 6

Red Hat Enterprise Linux 7

Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 9

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-11791 · Security Note
• https://redhat.atlassian.net/browse/PSIRTSUPT-7600 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2485414 · Note
• https://access.redhat.com/security/cve/CVE-2026-11791 · Note