Skip to content

SAP NetWeaver ABAP CVE-2026-44747 (CVSS 9.9)

alt text

CVE-2026-44747 SAP NetWeaver ABAP Memory Corruption Out-of-Bounds Write Critical Patch

Overview

SAP's July 2026 Security Patch Day includes a critical vulnerability in SAP NetWeaver Application Server ABAP / ABAP Platform, tracked as CVE-2026-44747 (CVSS 9.9).

The issue is an out-of-bounds write memory-corruption flaw that can be exploited by an authenticated attacker to corrupt memory, potentially enabling unauthorized data access or modification and service disruption.

Technical Specifications

Attribute Details
Primary CVE CVE-2026-44747
Severity CVSS v3.1 9.9 (Critical)
Affected Stack SAP NetWeaver Application Server ABAP / ABAP Platform
Bug Class Out-of-bounds write / memory corruption
Attack Prerequisite Authenticated access
Primary Risk Memory corruption leading to data compromise and potential denial of service
Exploitation Status (public) No confirmed in-the-wild exploitation publicly reported at patch release time
Patch Window July 2026 SAP Security Patch Day
  • CVE-2026-27690: HTTP request smuggling in SAP Approuter (non-Cloud Foundry), CVSS 9.1, with response desynchronization and DoS risk.
  • CVE-2026-44761: Default OAuth 2.0 sample client exposure in SAP Commerce Cloud, CVSS 9.1, potentially enabling unauthorized access if default examples remain active.
  • CVE-2026-44748: XML Signature Wrapping risk in NetWeaver ABAP context (reported by national advisories), CVSS 9.9.
  • CVE-2026-27671: Kernel-level memory corruption in NetWeaver ABAP context (reported by national advisories), CVSS 9.8.

Affected Products

  • SAP NetWeaver Application Server ABAP deployments requiring July 2026 updates
  • SAP ABAP Platform environments with exposed or broadly reachable ABAP/RFC service paths
  • Organizations running large ERP landscapes where ABAP and integration components are mission-critical

Attack Scenario

  1. An attacker obtains authenticated access to a vulnerable SAP NetWeaver ABAP environment.
  2. Crafted requests trigger the out-of-bounds write condition in vulnerable memory-management logic.
  3. Memory corruption causes unstable behavior and can be leveraged for unauthorized access to sensitive data paths.
  4. In chained scenarios, additional SAP weaknesses may be combined to elevate impact, including authentication bypass, deeper system compromise, or sustained service disruption.

Impact Assessment

  • Unauthorized data modification risk within business-critical ABAP workflows
  • Potential corruption of application logic or transactional behavior
  • Chaining with related flaws can increase likelihood of broader SAP landscape compromise
  • Unauthorized read-access to sensitive enterprise data handled by SAP modules
  • Potential exposure of regulated business records in high-value ERP environments
  • Increased risk where privileged ABAP access is over-provisioned
  • Memory-corruption conditions can trigger service crashes and operational instability
  • Potential denial-of-service impact on core ERP and dependent business functions
  • Delayed patching increases outage and incident-response risk

Mitigation Strategies

Immediate Actions

  • Apply SAP July 2026 Security Patch Day updates that remediate CVE-2026-44747
  • Validate relevant SAP Security Notes for your exact SAP_BASIS and kernel versions
  • Prioritize patching for internet-exposed and business-critical SAP systems

Access Control Hardening

  • Minimize ABAP/RFC-facing privileged accounts and review role assignments
  • Enforce least privilege for SAP users, administrators, and service identities
  • Require strong authentication controls, including MFA where technically supported

Monitoring & Detection

  • Monitor SAP application logs and RFC activity for malformed or anomalous requests
  • Alert on crash patterns, memory-related instability, and unusual privileged operations
  • Forward SAP telemetry to SIEM/SOAR for cross-environment correlation and triage

Compensating Controls

  • Where immediate patching is constrained, tighten network segmentation and restrict SAP management/service interfaces
  • Increase logging, alerting, and incident-response readiness around ABAP and integration tiers
  • Schedule emergency change windows for high-risk systems instead of deferring to routine maintenance

Resources and References

Public Reporting

Last Updated: July 15, 2026