CVE-2026-81479 Overview
CVE-2026-81479 affects Dell OpenManage Server Administrator (OMSA) versions prior to 11.1.0.3. The vulnerability stems from a Partial String Comparison weakness [CWE-187] in the product's local access handling. A low-privileged attacker with local access to an affected system can exploit this flaw to cause a denial of service condition.
The issue is tracked in Dell Security Advisory DSA-2026-403 and requires local privileges rather than network access. Successful exploitation disrupts availability of the OpenManage Server Administrator service, impacting server management and monitoring workflows on affected Dell PowerEdge deployments.
Critical Impact
Local attackers with low privileges can trigger a denial of service condition in Dell OpenManage Server Administrator, disrupting server management capabilities on affected hosts.
Affected Products
- Dell OpenManage Server Administrator (OMSA) versions prior to 11.1.0.3
- Dell PowerEdge servers running vulnerable OMSA installations
- Systems relying on OMSA for hardware monitoring and management
Discovery Timeline
- 2026-09-17 - CVE-2026-81479 published to the National Vulnerability Database
- 2026-09-17 - Last updated in NVD database
Technical Details for CVE-2026-81479
Vulnerability Analysis
CVE-2026-81479 is a Partial String Comparison vulnerability [CWE-187] in Dell OpenManage Server Administrator. Partial string comparison flaws arise when code compares only a portion of a string rather than the entire value. This allows crafted inputs to match sensitive tokens, identifiers, or command names that would otherwise be rejected by a full comparison.
In the context of OMSA, the flawed comparison logic can be reached by a local, authenticated user with low privileges. Once triggered, the condition affects service stability and availability. The scope remains unchanged, meaning the impact is contained to the vulnerable component and the host running OMSA.
The vulnerability yields limited confidentiality and integrity impact but a high availability impact. This aligns with a denial of service outcome rather than data theft or code execution. Attack complexity is high, indicating that specific conditions must be met to reliably reproduce the issue.
Root Cause
The root cause is improper string comparison logic within OMSA, where only a prefix or partial substring is evaluated. This weakness allows inputs that share a leading substring with expected values to be treated as matches. Dell addressed the flaw in OMSA release 11.1.0.3.
Attack Vector
Exploitation requires local access to the target host and low-level privileges on the system. The attacker does not require user interaction. By supplying crafted input to the vulnerable comparison path, the attacker causes the OMSA service to enter a state that disrupts availability. Full technical details are available in the Dell Security Update for OMSA.
Detection Methods for CVE-2026-81479
Indicators of Compromise
- Unexpected termination or restart of the dsm_om_connsvc or related OMSA services
- Repeated OMSA service crashes correlated with local user sessions
- OMSA log entries indicating malformed or truncated input passed to internal comparison routines
Detection Strategies
- Inventory hosts running Dell OpenManage Server Administrator and confirm installed versions against 11.1.0.3
- Correlate local logon events with OMSA service status changes to identify potential abuse patterns
- Alert on process crashes and abnormal termination signals originating from OMSA binaries
Monitoring Recommendations
- Track service availability of OMSA management daemons and web components in host monitoring tools
- Forward Windows and Linux service control logs to a centralized SIEM for correlation with authentication data
- Monitor local privilege boundaries on servers hosting OMSA to detect low-privileged accounts attempting management actions
How to Mitigate CVE-2026-81479
Immediate Actions Required
- Upgrade Dell OpenManage Server Administrator to version 11.1.0.3 or later on all affected systems
- Restrict local logon rights on servers running OMSA to trusted administrators only
- Audit local accounts and remove unnecessary interactive access on management hosts
Patch Information
Dell has released a fixed version of OpenManage Server Administrator that resolves CVE-2026-81479. Administrators should apply the update documented in Dell Security Advisory DSA-2026-403. Upgrade all instances to OMSA 11.1.0.3 or later to eliminate the vulnerable comparison logic.
Workarounds
- Limit local access to OMSA-managed servers using host-based access controls and jump server enforcement
- Reduce the number of accounts holding local logon rights on servers hosting OMSA
- Enforce least privilege for operational and monitoring accounts that interact with OMSA components
# Configuration example: verify installed OMSA version on Linux
rpm -qa | grep -i srvadmin
# On Windows PowerShell
Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like '*OpenManage Server Administrator*' } | Select-Object Name, Version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
