SAP Patches Critical NetWeaver Memory Corruption Flaw CVE-2026-XXXXX

Key Takeaways

• SAP has released its July 2026 security updates, addressing a critical memory corruption vulnerability in SAP NetWeaver Application Server ABAP.
• The most severe flaw, CVE-2026-44747, carries a CVSS score of 9.9 and affects numerous SAP kernel versions critical to enterprise operations.
• Successful exploitation could lead to arbitrary code execution, data manipulation, service disruption, and unauthorized access to sensitive information.
• Organizations must prioritize the immediate application of patches available via the SAP Support Portal to mitigate significant risks.

SAP Addresses Critical NetWeaver Flaw in July 2026 Patch Release

SAP has issued its comprehensive July 2026 Security Patch Day updates, highlighting a severe memory corruption vulnerability within the SAP NetWeaver Application Server ABAP. This critical flaw, identified as CVE-2026-44747, has been assigned a CVSS score of 9.9, underscoring its extreme severity and potential impact on enterprise environments.

On July 14, SAP published a total of 16 new security notes and one GitHub security advisory. Additionally, three previously released notes received updates. System administrators are strongly advised to promptly assess their SAP landscapes and apply the necessary fixes, which are accessible through the SAP Support Portal.

Details of the NetWeaver Memory Corruption Vulnerability

The primary concern, detailed in SAP Security Note 3747367, is CVE-2026-44747. This memory corruption vulnerability arises when an application fails to manage memory operations correctly. Such a flaw could be leveraged by an attacker to alter program execution flows, gain access to confidential data, trigger service crashes, or execute arbitrary malicious code under specific conditions.

The vulnerability impacts a broad range of SAP kernel and NetWeaver versions. Affected kernel versions include KRNL64NUC and KRNL64UC 7.22 and 7.22EXT, alongside kernel versions 7.53, 7.54, 7.77, 7.89, 7.93, 9.16, 9.18, 9.19, and 9.20. Before deploying patches, organizations must verify the specific software components and their current patch levels within their SAP infrastructure.

According to the assigned CVSS vector, exploitation of this vulnerability is network-based, requires low attack complexity, demands minimal privileges, and does not necessitate user interaction. This combination of factors makes it highly attractive to malicious actors.

Broader Implications and Other Critical Fixes

A successful exploit of CVE-2026-44747 could severely compromise the confidentiality, integrity, and availability of affected systems. Furthermore, the attack scope allows for potential lateral movement, enabling a compromised component to affect resources beyond its initial security boundary.

Beyond the NetWeaver flaw, SAP’s July Patch Day addresses two other critical vulnerabilities:

• CVE-2026-27690: An HTTP request smuggling vulnerability in SAP Approuter versions preceding 20.10.0, rated with a CVSS score of 9.1. Attackers could exploit this to bypass front-end security mechanisms or manipulate how back-end systems process HTTP requests.
• CVE-2026-44761: An insecure sample credentials flaw impacting SAP Commerce Cloud releases HY_COM 2205, COM_CLOUD 2211, and 2211-JDK21, also scoring 9.1. Default, exposed, or poorly protected credentials can facilitate unauthorized access to these environments.

SAP also provided an update to its June security note for CVE-2026-40128, a directory traversal vulnerability found in the SAP NetWeaver Application Server Java Web Container. This issue, with a CVSS score of 9.0, could allow attackers to access or modify files outside their intended directory path.

What You Should Do

• Prioritize Patching: Immediately apply the patches outlined in SAP Note 3747367 for CVE-2026-44747, and address all other critical vulnerabilities.
• Verify Compatibility: Before deployment, validate kernel compatibility and test patches in non-production environments to prevent operational disruptions.
• Accelerate Deployment: Prioritize and schedule accelerated deployment for internet-facing or business-critical NetWeaver instances.
• Restrict Network Access: Limit unnecessary network access to SAP application servers.
• Review Privileged Accounts: Regularly audit and secure privileged accounts.
• Monitor System Logs: Implement robust monitoring for system logs to detect any abnormal activity.
• Ensure Backups: Confirm that comprehensive backups are available before initiating any maintenance or patching operations.

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