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CVE-2026-94407— IBM ContextForge MCP Gateway is affected by a regular expression denial of service

Quick assessment

Affected

IBM ContextForge MCP Gateway

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 ContextForge MCP Gateway 1.0.0 至 1.0.11 版本可能存在拒绝服务漏洞，原因是正则表达式复杂度失控（CWE-400 / ReDoS）。拥有工具注册权限的已认证用户可以在工具的 JSON Schema 字段中嵌入具有灾难性回溯特性的正则表达式模式；当 ContextForge 根据该 Schema 验证参数时，验证过程可能会消耗无限制的 CPU 资源，从而可能导致网关可用性下降。

CVSS 6.5 · Medium EPSS 0.24% · P14 Updated Nov 15, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of Service

Affected Version Matrix 1

Vendor	Product	Version Range	Status
IBM	ContextForge MCP Gateway	`1.0.0≤ 1.0.11`	affected

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Vulnerability Information

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Vulnerability Title

IBM ContextForge MCP Gateway is affected by a regular expression denial of service

Source: CVE Program / CVE List V5

Vulnerability Description

IBM ContextForge MCP Gateway 1.0.0 through 1.0.11 is potentially vulnerable to denial of service due to uncontrolled regular expression complexity (CWE-400 / ReDoS). An authenticated user with tool-registration privileges can embed catastrophically backtracking regex patterns in a tool's JSON Schema `pattern` field; when ContextForge validates arguments against that schema, the validation call may consume unbounded CPU, potentially degrading gateway availability.

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-1333

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
IBM	ContextForge MCP Gateway	1.0.0 ~ 1.0.11	`cpe:2.3:a:ibm:contextforge_mcp_gateway:1.0.0:::::::*`

II. Public POCs for CVE-2026-94407

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-94407

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Other References for CVE-2026-94407 (1)

Security Bulletin: IBM ContextForge MCP Gateway is affected by a regular expression denial of service vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2026-94407

Same Patch Batch · IBM · 2026-11-13 · 21 CVEs total

CVE-2026-91869	8.1 HIGH	IBM Security QRadar EDR Improper Restriction of Excessive Authentication Attempts
CVE-2026-115788	8.1 HIGH	IBM App Connect Operator and IBM App Connect Enterprise Certified Containers Operands Log
CVE-2026-110279	8.1 HIGH	IBM ContextForge MCP Gateway is affected by an improper authentication vulnerability
CVE-2026-109158	7.5 HIGH	IBM App Connect Operator and IBM App Connect Enterprise Certified Containers Operands Inse
CVE-2026-123628	7.5 HIGH	IBM webMethods Integration Server is vulnerable to sensitive information disclousure via a
CVE-2026-110278	7.4 HIGH	IBM ContextForge MCP Gateway is affected by an information exposure vulnerability
CVE-2026-91868	6.5 MEDIUM	IBM Security QRadar EDR Improper Access Control
CVE-2026-110189	6.5 MEDIUM	IBM ContextForge MCP Gateway is affected by a denial of service due to an incomplete list
CVE-2026-82102	6.4 MEDIUM	DataStage on Cloud Pak for Data has vulnerabilities due to open source software
CVE-2026-9870	6.1 MEDIUM	IBM Cyber Fraud includes components with multiple known vulnerabilities
CVE-2026-114468	6.0 MEDIUM	IBM App Connect Operator and IBM App Connect Enterprise Certified Containers Operands Hard
CVE-2026-110194	5.4 MEDIUM	IBM ContextForge MCP Gateway is affected by a server-side request forgery vulnerability
CVE-2026-110195	5.4 MEDIUM	IBM ContextForge MCP Gateway is affected by an authorization bypass vulnerability
CVE-2026-9821	5.3 MEDIUM	IBM Cyber Fraud includes components with multiple known vulnerabilities
CVE-2026-115501	5.3 MEDIUM	IBM i is Affected By A Buffer Overflow Vulnerability in QFileSvr.400 File System []
CVE-2026-110199	4.8 MEDIUM	IBM ContextForge MCP Gateway is affected by a DOM-based cross-site scripting
CVE-2026-110178	4.1 MEDIUM	IBM ContextForge MCP Gateway is affected by an improper access control vulnerability in co
CVE-2026-108290	4.0 MEDIUM	IBM Cyber Fraud includes components with multiple known vulnerabilities
CVE-2026-5514	3.3 LOW	IBM Bob is vulnerable to unauthorized session token exposure due to improper handling of a
CVE-2026-97683	2.5 LOW	IBM Cyber Fraud includes components with multiple known vulnerabilities

IV. Related Vulnerabilities

Same product: ContextForge MCP Gateway

Same vendor: IBM

Same weakness: CWE-1333