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CVE Record

CVE-2026-48163: MariaDB: wsrep SST unsafe parameter handling on the donor side (rsync)

MariaDB server is a community developed fork of MySQL server. From versions 10.6.1 to before 10.6.27, 10.11.1 to before 10.11.18, 11.4.1 to before 11.4.12, 11.8.1 to before 11.8.8, and 12.3.1, during the SST the donor node is interpolating parameters that the joiner sent into the command line. Not all parameters were properly validated which could allow a malicious joiner to execute arbitrary shell commands on the donor side via the rsync SST method. This issue has been patched in versions 10.6.27, 10.11.18, 11.4.12, 11.8.8, and 12.3.2.

CriticalCVSS 9.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

A malicious MariaDB cluster joiner can make a donor node run unintended shell commands during rsync-based state transfer. This is critical because compromise of a database donor can affect confidentiality, integrity, and availability of data, but the attacker must already have high privileges to act as a joiner.

Executive priority

Treat as urgent for production MariaDB clusters using wsrep and rsync SST. Prioritize patching clustered database environments before standalone systems, because exploitation targets donor nodes during cluster synchronization.

Technical view

CVE-2026-48163 is CWE-78 command injection in MariaDB wsrep SST donor handling. In affected versions, donor-side rsync SST command construction interpolates joiner-supplied parameters without complete validation, allowing arbitrary shell command execution on the donor. Patched releases are 10.6.27, 10.11.18, 11.4.12, 11.8.8, and 12.3.2.

Likely exposure

Exposure is most likely in MariaDB Galera/wsrep clusters running affected versions and using the rsync SST method. Standalone deployments, non-wsrep use, or non-rsync SST exposure is not established by the provided sources.

Exploitation context

The CVSS vector is network-reachable, low complexity, no user interaction, but high privileges are required. The bundle marks KEV as false and provides no evidence of active exploitation or public weaponized use.

Researcher notes

The key boundary is donor trust during SST: attacker-controlled joiner parameters reach donor command construction. Evidence is sufficient for affected versions and patched versions, but the bundle does not include exploit artifacts, active exploitation, or broader product impact.

Mitigation direction

  • Upgrade MariaDB to 10.6.27, 10.11.18, 11.4.12, 11.8.8, or 12.3.2.
  • Apply relevant Red Hat security errata when using Red Hat-distributed MariaDB packages.
  • Confirm only trusted administrators can introduce or control wsrep joiner nodes.
  • Review MariaDB and distribution vendor guidance for any environment-specific SST hardening steps.

Validation and detection

  • Inventory MariaDB server versions and compare them with the affected version ranges.
  • Identify clusters using wsrep/Galera and determine whether rsync SST is enabled.
  • Check package provenance against MariaDB releases or applicable Red Hat errata.
  • Review recent cluster membership and SST events for unexpected joiner activity.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-78: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-48163 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.1 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
13Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.1CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H2.36redhat-SADP
8CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H1.36GitHub_M

Vulnerability scoring details

Base CVSS 3.1 score

9.1Critical
CVSS 3.1 vector shape for CVE-2026-48163Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPmariadb: Arbitrary code execution via improper parameter validation during SST
other:Red Hat severity ratingcvssV3_1
  • 2026-06-12T18:01:12.767Z: Reported to Red Hat.
  • 2026-06-12T17:34:57.923Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MariaDBserver>= 10.6.1, < 10.6.27, >= 10.11.1, < 10.11.18, >= 11.4.1, < 11.4.12, >= 11.8.1, < 11.8.8, >= 12.3.1, < 12.3.2Listed
Weakness

CWE details

CWE-78

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-78 · source CWE mapping

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs