IBM QRadar SIEM Out-of-Bounds Read Vulnerability Exposes Remote Attackers

IBM QRadar SIEM contains a high-severity vulnerability that allows remote attackers to disrupt services or access sensitive data. The flaw exists in specific versions of the security information and event management platform.

What happened

The National Vulnerability Database records CVE-2026-93442 as an out-of-bounds read weakness within IBM QRadar SIEM. This issue affects versions 7.6.0.0 through 7.6.0.4, as well as version 7.5.0 through Update Package 16 Interim Fix 001. According to the record, a remote attacker can exploit this flaw to cause a denial of service. The vulnerability also permits the attacker to obtain sensitive information from the affected systems. The National Vulnerability Database assigns a CVSS score of 8.2 to this issue, classifying it as high severity. The weakness is categorised under CWE-125, which denotes out-of-bounds read errors.

Why it matters

Organisations running the specified IBM QRadar versions are exposed to remote exploitation. The ability to cause a denial of service threatens the continuous operation of security monitoring infrastructure. Additionally, the potential for sensitive information disclosure compromises the integrity of the data collected by the SIEM. Security teams must assess their environments for these specific version ranges immediately. The high CVSS score indicates significant risk to both availability and confidentiality of the systems.

Next steps

• Inventory all IBM QRadar SIEM instances to identify those running versions 7.6.0.0 through 7.6.0.4 or 7.5.0 through Update Package 16 Interim Fix 001.
• Monitor network traffic for unusual patterns that may indicate remote exploitation attempts or denial of service activity.
• Review access logs for any unauthorised attempts to access sensitive information from the SIEM platform.
• Prepare to isolate affected systems if exploitation is confirmed, pending further vendor guidance.

Detection notes

Teams usually monitor for anomalous traffic spikes that suggest a denial of service attack against SIEM components. Check whether memory access errors appear in system logs, which may indicate out-of-bounds read attempts. Look for unexpected data exfiltration patterns or unusual queries accessing sensitive repositories. Verify that network segmentation controls are functioning correctly to limit remote access. Ensure that intrusion detection systems are tuned to alert on suspicious activity targeting the SIEM management interfaces.

What to do and how to stay safe: IBM QRadar

• Verify your IBM QRadar SIEM version against the affected list and document any exposure.
• Implement strict network access controls to limit remote connectivity to the SIEM management ports.
• Monitor system performance metrics for signs of degradation that could indicate a denial of service attack.
• Review audit logs for any unauthorised access attempts or data retrieval activities during the exposure window.

Step-by-step guide: Emergency Patching: How to Fix Critical Flaws Without Breaking Production

General security guidance from the Packet Tribune newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Which IBM QRadar versions are affected by CVE-2026-93442?

Versions 7.6.0.0 through 7.6.0.4 and 7.5.0 through Update Package 16 Interim Fix 001 are affected.

What is the severity of this vulnerability?

The National Vulnerability Database rates it as high severity with a CVSS score of 8.2.

What can an attacker do with this flaw?

A remote attacker can cause a denial of service or obtain sensitive information.