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Vulnerability · Published Jun 18, 2026 · Assigned by redhat

CVE-2026-11791389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()

Medium 5.0

In plain English

A medium-severity use-after-free in Red Hat Directory Server 11 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.4%top 71.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12389-ds-baseno fix listedDEBIAN-CVE-2026-11791
Debian:13389-ds-baseno fix listedDEBIAN-CVE-2026-11791
Ubuntu:22.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11791
Ubuntu:24.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11791
Ubuntu:25.10389-ds-baseno fix listedUBUNTU-CVE-2026-11791
Ubuntu:26.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11791
Ubuntu:26.10389-ds-baseno fix listedUBUNTU-CVE-2026-11791

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Directory Server 11 see references
Red Hat Red Hat Directory Server 12 see references
Red Hat Red Hat Directory Server 13 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

References