Splunk Enterprise & Splunk DB Connect

Vendor: Splunk Inc.
Products Affected:

• Splunk Enterprise (Windows installations)
• Splunk DB Connect

Release Date: 18 February 2026
Overall Risk Level: High (Multiple Local Privilege Escalation vulnerabilities)
Impact Scope: Windows-based Splunk Enterprise deployments and Splunk DB Connect components

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1. CVE-2026-20140

(Local Privilege Escalation via DLL Search-Order Hijacking)

Basic CVE Information

Field	Details
CVE Name	Local Privilege Escalation via DLL Search-Order Hijacking
CVE ID	CVE-2026-20140
CVSS Score	8.4 (High)
Severity	High
Attack Vector	Local
Complexity	Low
Privileges Required	Low
User Interaction	Not Required
Exploitability	High in misconfigured environments
Exploit Availability	No public exploit at release (technique widely known)
Affected Platform	Splunk Enterprise on Windows

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Technical Overview

This vulnerability exists due to improper handling of Windows DLL search order when Splunk services start. Windows searches for required DLL files in a specific order. If an attacker can place a malicious DLL in a directory searched before the legitimate one, the service may load the attacker’s DLL instead.

Since Splunk services typically run as SYSTEM or another high-privileged account, this allows the attacker to escalate privileges to full system control.

The issue stems from:

• Unqualified DLL path usage
• Missing SafeDllSearchMode enforcement
• Service loading external libraries without explicit full path reference

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How It Could Be Exploited

An attacker must already have local access (for example, via a compromised low-privileged account).

Typical attack flow:

1. Identify a Splunk service executable loading a DLL without full path specification.
2. Drop a malicious DLL with the same filename into a writable directory in the search path.
3. Restart the Splunk service (or wait for system reboot).
4. The malicious DLL executes under SYSTEM privileges.

No user interaction is required.

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Potential Payloads

Because this results in SYSTEM-level execution, payload possibilities include:

• Creation of hidden administrative users
• Deployment of ransomware
• Credential dumping (LSASS memory scraping)
• Persistence via scheduled tasks or registry run keys
• Installation of backdoors
• Disabling security controls

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MITRE ATT&CK Mapping

Technique	ID
DLL Search Order Hijacking	T1574.001
Privilege Escalation	TA0004
Persistence via Hijacked DLL	T1574
Execution	TA0002

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Detection Guidance

Key Indicators

• New DLL files appearing in:
  • C:\Program Files\Splunk\bin
  • Service working directories
  • Writable directories referenced by PATH
• Unexpected Splunk service restarts
• Splunk service spawning unusual child processes
• Hash mismatch of DLL files

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Log Sources to Monitor

Log Source	Why Important
Windows Security Event Log	Process creation (Event ID 4688)
Sysmon Logs	DLL load events (Event ID 7)
Windows System Logs	Service restart events
EDR Telemetry	Suspicious module loads
Splunk Internal Logs	Service restart anomalies

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Detection Logic (Conceptual)

Monitor DLL load events where:

• Parent process = splunkd.exe
• DLL loaded from non-standard directory
• DLL unsigned or newly created within 24 hours

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Official Patch

Splunk addressed this by:

• Hardcoding full DLL paths
• Updating service configurations
• Improving binary load validation
• Updating Windows service configuration

Customers should upgrade to the latest patched version available in the official Splunk security advisory portal:
https://www.splunk.com/en_us/product-security.html

Immediate mitigation if upgrade not possible:

• Restrict write permissions on Splunk directories
• Remove Splunk directory from global PATH
• Enable Windows SafeDllSearchMode
• Monitor unauthorized file drops

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2. CVE-2026-20143

(Local Privilege Escalation via Python Module Search Path Manipulation)

Basic CVE Information

Field	Details
CVE Name	Local Privilege Escalation via Python Module Search Path
CVE ID	CVE-2026-20143
CVSS Score	8.6 (High)
Severity	High
Attack Vector	Local
Complexity	Low
Privileges Required	Low
User Interaction	Not Required
Exploitability	High in multi-user environments
Exploit Availability	No confirmed public PoC
Affected Platform	Splunk Enterprise (Windows)

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Technical Overview

Splunk Enterprise bundles Python for internal components. Python imports modules based on its sys.path search order.

If:

• Writable directories appear in Python’s module search path
• Environment variables (e.g., PYTHONPATH) can be influenced
• Or local directories precede trusted system paths

An attacker can plant a malicious .py module that overrides a legitimate module.

When Splunk runs as SYSTEM and imports that module, the malicious code executes with elevated privileges.

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How It Could Be Exploited

1. Attacker gains local access.
2. Identifies a Python module loaded by Splunk service.
3. Creates a malicious Python file with identical module name.
4. Places it in a directory searched before the legitimate module.
5. Restarts Splunk service.
6. Code executes as SYSTEM.

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Possible Payload Capabilities

• Reverse shell execution
• Credential harvesting
• Service account token theft
• Deployment of malware loaders
• Data exfiltration
• Tampering with Splunk logs to hide activity

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MITRE ATT&CK Mapping

Technique	ID
Hijack Execution Flow	T1574
Python Module Hijacking	T1574.001
Privilege Escalation	TA0004
Persistence	TA0003

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Detection Strategy

Indicators of Compromise

• Unexpected .py files in:
  • $SPLUNK_HOME\lib
  • $SPLUNK_HOME\bin
• File modifications shortly before service restart
• Suspicious outbound network connections from splunkd.exe
• Python subprocess execution anomalies

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Log Sources

Log Source	Monitoring Focus
Sysmon	File creation (Event ID 11)
Windows Security	Process creation
EDR	Script execution telemetry
Splunk Internal Logs	Python stack trace errors

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Detection Logic (Conceptual)

Trigger alert when:

• splunkd.exe loads a Python module from writable directory
• Module not digitally signed
• File recently modified
• Unexpected network connection follows module load

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Official Patch

Splunk remediated this issue by:

• Sanitizing Python module search paths
• Removing writable directories from sys.path
• Hardening environment variable handling
• Updating bundled Python runtime configurations

Customers should update via the official Splunk security advisory page:
https://www.splunk.com/en_us/product-security.html

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3. SVD-2026-0212

(Third-Party Package Updates in Splunk DB Connect)

Basic Information

Field	Details
Advisory ID	SVD-2026-0212
Severity	High
Component	Splunk DB Connect
Issue Type	Third-Party Dependency Vulnerabilities
CVE Assignment	Multiple upstream CVEs

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Technical Overview

This advisory addresses vulnerabilities in bundled third-party libraries used by Splunk DB Connect.

These may include:

• JDBC connectors
• Java runtime libraries
• Open-source frameworks
• Logging libraries

While Splunk code itself may not be directly vulnerable, outdated packages may contain known exploitable flaws.

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Risk Impact

Potential impacts:

• Remote code execution (if vulnerable libraries exposed)
• Deserialization attacks
• SQL injection via connectors
• Information disclosure
• Authentication bypass

Risk depends on:

• Deployment architecture
• Exposure of DB Connect to untrusted networks
• Database authentication configuration

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Detection & Monitoring

Monitor:

• Java process anomalies
• Unexpected outbound DB Connect traffic
• Suspicious JDBC connection strings
• Application crash logs
• Unauthorized configuration changes

Log Sources:

• Splunk DB Connect logs
• Java runtime logs
• Windows Event Logs
• Network firewall logs
• Database audit logs

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Official Patch

Splunk updated affected third-party packages to secure versions.

Upgrade DB Connect to the latest February 2026 release via:
https://www.splunk.com/en_us/product-security.html

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Overall Risk Assessment

These vulnerabilities are especially dangerous in:

• Shared Windows servers
• Environments with multiple local users
• Systems without strict file permission controls
• Environments lacking EDR visibility

While remote exploitation is not directly possible, once an attacker gains initial foothold, these vulnerabilities make full system compromise straightforward.

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Recommended Immediate Actions

1. Upgrade Splunk Enterprise and DB Connect immediately.
2. Restrict NTFS write permissions to Splunk directories.
3. Monitor for unauthorized DLL and Python file creation.
4. Enable Sysmon with DLL load monitoring.
5. Validate integrity of Splunk installation files.
6. Review service account privileges.
7. Deploy EDR behavioral monitoring rules.

If properly patched and monitored, risk is fully mitigated. However, unpatched Windows deployments remain highly exposed to post-compromise privilege escalation.

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