High [CVE-2026-58221] authenticated LDAP access to internal LDB special DNs permits domain takeover
This high-severity Red Hat Linux advisory covers CVE-2026-58221.
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Summary
A flaw was found in Samba Active Directory Domain Controller (AD DC). Improper authorization checks allow an authenticated low-privilege domain user to modify internal LDB special records through LDAP.
By altering the DSDB module configuration, an attacker can bypass directory ACL enforcement on new LDAP connections and elevate privileges, potentially leading to complete domain compromise. ``` Red Hat Enterprise Linux (RHEL) context: Default installations of Red Hat Enterprise Linux (RHEL) are not affected.
Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-284.
Red Hat lists 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; Red Hat OpenShift Container Platform 4 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 23 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 23 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 23 days ago·verify at source
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