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CWE-90Weakness · CWE-90

CVE-2026-58222

HIGH · 8.8 CVSS v3.1 Published 2026-07-30
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable Zero-click 3 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Samba AD DC fails to validate user-supplied attribute names in LDAP Compare requests, combining LDAP filter injection with improper authorization checks. This allows authenticated low-privilege users to execute internal database searches in a trusted context, bypassing ACL enforcement and disclosing confidential attributes like msKds-RootKeyData that can be leveraged to derive gMSA passwords offline.

MitigationApply Samba security patches when available; restrict LDAP Compare permissions to prevent low-privilege users from accessing sensitive attributes; audit for unauthorized attribute enumeration and gMSA key exposure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Samba AD DC is running
    Check smb.conf for 'server role = active directory domain controller' or look for smbd, winbindd, and samba processes running as domain controller
    Affected if Samba is configured and running as an Active Directory Domain Controller
  2. Check Samba version
    Run 'samba --version' or 'smbd -V' to get the installed Samba version
    Affected if The installed version is older than the patched version for CVE-2026-58222 (version comparison required against vendor advisories)
  3. Verify if gMSAs exist in the environment
    Run LDAP query for objects with objectClass=msDS-ManagedServiceAccount or check AD for gMSA accounts using ldp.exe or ldapsearch
    Affected if Group Managed Service Accounts exist in the AD domain (the vulnerability targets msKds-RootKeyData which is used for gMSA password generation)
  4. Test low-privilege user LDAP compare access
    Using an authenticated low-privilege test account, perform an LDAP compare operation requesting the msKds-RootKeyData attribute against a domain object
    Affected if A low-privilege authenticated user can successfully read msKds-RootKeyData via LDAP compare (this indicates ACL bypass)
  5. Audit LDAP permissions on msKds-RootKeyData
    Check ACLs on the msKds-RootKeyData attribute in AD using dsacls or ldapsearch with proper admin credentials to verify expected access restrictions
    Affected if The attribute shows permissions allowing read access by non-privileged users, or permissions appear to be bypassed

If Samba AD DC is running with a version lacking the CVE-2026-58222 patch AND gMSAs exist in the environment AND low-privilege users can read msKds-RootKeyData via LDAP compare, the environment is vulnerable to domain compromise through gMSA password derivation.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply Samba security patches when available; restrict LDAP Compare permissions to prevent low-privilege users from accessing sensitive attributes; audit for unauthorized attribute enumeration and gMSA key exposure.

Have this fixed Scoped from the published advisory
  • Consultation8.0 h
  • Implementation12.0 h
  • Testing16.0 h
  • Review / QA8.0 h
44.0 hours of engineering $7,600
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-58222 in production — separate from our analysis above.

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