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CVE-2026-11906— IBM® Db2® federated server is vulnerable to a denial of service due to improper neutralization of special elements in the data query logic of XMLTable-derived columns by autheticated user

Quick assessment

Affected
IBM Db2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM DB2是美国IBM公司的一套关系型数据库管理系统。该系统的执行环境主要有UNIX、Linux、IBMi、z/OS以及Windows服务器版本。 IBM DB2 11.5.0版本至11.5.9版本和12.1.0版本至12.1.4版本存在输入验证错误漏洞，该漏洞源于在XMLTable派生列的数据查询逻辑中对特殊元素中和不当，可能导致经过身份验证的用户造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
IBM Db2 11.5.0≤ 11.5.9 affected
12.1.0≤ 12.1.4 affected
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I. Basic Information for CVE-2026-11906

Vulnerability Information
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Vulnerability Title
IBM® Db2® federated server is vulnerable to a denial of service due to improper neutralization of special elements in the data query logic of XMLTable-derived columns by autheticated user
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 for Linux, UNIX and Windows (includes Db2 Connect Server) could allow an authenticated user to cause a denial of service due to improper neutralization of special elements in the data query logic of XMLTable-derived columns.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
IBM DB2 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM DB2是美国IBM公司的一套关系型数据库管理系统。该系统的执行环境主要有UNIX、Linux、IBMi、z/OS以及Windows服务器版本。 IBM DB2 11.5.0版本至11.5.9版本和12.1.0版本至12.1.4版本存在输入验证错误漏洞，该漏洞源于在XMLTable派生列的数据查询逻辑中对特殊元素中和不当，可能导致经过身份验证的用户造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM Db2 11.5.0 ~ 11.5.9 cpe:2.3:a:ibm:db2:11.5.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-11906

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III. Intelligence Information for CVE-2026-11906

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Vendor Advisories for CVE-2026-11906 (1)

Same Patch Batch · IBM · 2026-06-30 · 43 CVEs total

CVE-2026-10134 10.0 CRITICAL Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows
CVE-2026-7873 9.9 CRITICAL Code Injection Vulnerability in Code Validation Endpoint
CVE-2026-7871 9.8 CRITICAL Insecure Deserialization in Redis Cache Backend
CVE-2026-7803 9.8 CRITICAL Flow Validation Bypass via Empty Component Type Field
CVE-2026-10109 9.8 CRITICAL IBM® Db2® is vulnerable to remote code execution due to improper pre-auth DRDA handshake h
CVE-2026-10140 9.6 CRITICAL Cross-Tenant API Key Reuse and Billing Fraud in Langflow Voice Mode Subsystem
CVE-2026-11708 9.3 CRITICAL IBM WebSphere Application Server is affected by a cross-site scripting vulnerability
CVE-2026-11712 9.3 CRITICAL IBM WebSphere Application Server is affected by a cross-site scripting vulnerability
CVE-2026-7874 9.1 CRITICAL Weak Cryptographic Key Derivation Exposed All Stored Credentials
CVE-2026-7663 9.1 CRITICAL Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport
CVE-2026-11594 8.5 HIGH IBM WebSphere Application Server is affected by multiple cross-site scripting vulnerabilit
CVE-2026-10129 8.5 HIGH SSRF via HTTP Redirect Following in Langflow API Request Component
CVE-2026-11714 8.5 HIGH IBM WebSphere Application Server Liberty is affected by an authorization bypass vulnerabil
CVE-2026-10560 8.2 HIGH Unauthenticated Access to Private Flow Build Events and Cancellation in Langflow OSS
CVE-2026-10564 8.2 HIGH SSRF Vulnerability in Langflow OSS Legacy Components Bypasses Protection
CVE-2025-36359 8.1 HIGH IBM DevOps Loop is susceptible to an Insufficient Session Expiration vulnerability.
CVE-2026-13449 7.6 HIGH XXE attack in IBM Business Automation Manager Open Editions
CVE-2026-13759 7.5 HIGH IBM WebSphere eXtreme Scale is affected by Insecure Deserilization
CVE-2026-13772 7.5 HIGH IBM WebSphere eXtreme Scale's OQL is affected by remote code execution
CVE-2026-11541 7.4 HIGH Inconsistent Interpretation of HTTP Requests in CICS Transaction Gateway for Multiplatform

Showing top 20 of 43 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Db2
Same vendor: IBM
Same weakness: CWE-1284

V. Comments for CVE-2026-11906

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