Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-89126 |
| Alert Source | GitHub Advisory - Critical Vulnerability |
| CVE Publication Year | 2026 |
| Date Published | 2026-11-10 |
| Vendor | SAP |
| Product | Web Dispatcher |
| Vulnerability Type | heap-based buffer overflow, remote code execution (RCE) (CWE-122) |
| SAP Note | 3778556 |
| CVSS Score | 10.0 (critical) |
| EPSS Score | No data |
| CISA KEV | No |
| Ransomware | Not confirmed |
Vulnerability Description
Source: NVD, SAP
SAP Web Dispatcher does not sufficiently validate certain network input processed by an internal component. An unauthenticated attacker could send specially crafted network traffic to trigger a memory corruption condition in the affected functionality. Successful exploitation could allow the attacker to execute arbitrary code and fully compromise the system, resulting in a high impact on confidentiality, integrity and availability of the system.
The flaw was published as part of the November 2026 SAP Security Patch Day. The attack requires no authentication.
Required Actions
- Apply the fix from SAP Note 3778556 (SAP Security Patch Day, November 2026) as a priority: Web Dispatcher often sits at the network edge and accepts internet traffic.
- Inventory all SAP Web Dispatcher instances (including those in the DMZ and in front of SAP Fiori / portals) and their versions.
- Until patched, monitor Web Dispatcher process crashes and restarts, which may indicate exploitation attempts.
Who Is Affected?
This vulnerability affects SAP Web Dispatcher. NVD provides no CPE configuration; affected versions and support packages are listed in SAP Note 3778556 (requires an SAP for Me account). SAP systems are mainly used by mid-sized and large enterprises (ERP, S/4HANA, NetWeaver platforms), so also check systems operated by partners and service providers.
The same Patch Day covered eight other critical SAP flaws: CVE-2026-109795, CVE-2026-109798, CVE-2026-109803, CVE-2026-120017, CVE-2026-76964, CVE-2026-76965, CVE-2026-89103, CVE-2026-89119.
Sources
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Frequently asked questions
What is the CVE-2026-89126 vulnerability?
CVE-2026-89126 is a vulnerability in SAP Web Dispatcher — heap-based buffer overflow, remote code execution (RCE) — rated CVSS 10 (critical severity). SAP released a fix in Note 3778556 as part of the November 2026 SAP Security Patch Day.
Does exploiting CVE-2026-89126 require authentication?
According to the vendor's CVSS assessment, the attack requires no authentication. The attack is carried out over the network.
How to protect against CVE-2026-89126?
Apply the fix from SAP Note 3778556 and, until it is deployed, restrict network access to the affected component. The note lists affected versions and any available workarounds.
Who is affected by CVE-2026-89126?
It affects organizations running SAP Web Dispatcher, typically mid-sized and large enterprises with SAP ERP or S/4HANA and the related NetWeaver components.
