High [CVE-2026-58222] Samba AD LDAP Compare filter injection and trusted-request confusion disclose protected attributes
This high-severity Red Hat Linux advisory covers CVE-2026-58222.
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Summary
A security flaw combining LDAP filter injection and improper authorization checks was found in Samba Active Directory Domain Controller (AD DC).
When processing LDAP Compare requests, Samba fails to properly validate user-supplied attribute names and executes the resulting internal database search in a trusted context, bypassing normal Access Control List (ACL) enforcement.
An authenticated low-privilege domain user can exploit these flaws to disclose confidential Active Directory attributes that would normally be inaccessible. The disclosed information may be leveraged to derive sensitive authentication material, potentially leading to privilege escalation and complete domain compromise.
For example: In deployments configured with Group Managed Service Accounts (gMSAs), an attacker can extract the "msKds-RootKeyData" attribute and derive gMSA passwords offline, potentially leading to complete domain compromise if privileged gMSAs are present.
Red Hat Product Security has rated this vulnerability as having an Important security impact for Samba deployments operating as an Active Directory Domain Controller (AD DC) ``` Red Hat Enterprise Linux (RHEL) context: Standard installations of Red Hat Enterprise Linux (RHEL) are not affected.
RHEL packages Samba strictly to operate as a file server (smbd), print server, or Active Directory domain member (winbindd).
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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