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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).

PUBLISHED Reserved 2026-06-09 | Published 2026-06-18 | Updated 2026-06-18 | Assigner redhat




MEDIUM: 5.0CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

Problem types

Use After Free

Product status

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affected

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affected

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affected

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affected

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unaffected

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affected

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affected

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affected

Timeline

2026-04-16:Reported to Red Hat.
2026-04-16:Made public.

References

access.redhat.com/security/cve/CVE-2026-11791 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2485414 (RHBZ#2485414) issue-tracking

redhat.atlassian.net/browse/PSIRTSUPT-7600

cve.org (CVE-2026-11791)

nvd.nist.gov (CVE-2026-11791)

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