389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()_CVE-2026-11791

5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

Description

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).

Basic Information

ID CVE-2026-11791

Source redhat

Published Jun 18, 2026 at 14:44

Modified Jun 18, 2026 at 15:24

Affected Product

Vendor Red Hat

Product Red Hat Directory Server 11

CWE Classification

CWE-416

References

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    "published": "2026-06-18T14:44:32.350Z",
    "modified": "2026-06-18T15:24:19.371Z",
    "type": "cve",
    "title": "389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2026-11791\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2485414\nhttps://redhat.atlassian.net/browse/PSIRTSUPT-7600",
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