cve.bz

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

6.5 medium

Medium (6.5) in ibm contextforge mcp gateway.

On this page
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.

Severity

CVSS 3.1

6.5 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-1333 Inefficient Regular Expression Complexity
Published
Modified
Assigned by
ibm (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

Ask an AI about this CVE

ChatGPTClaudeGoogle AI Mode

Show the promptExplain CVE-2026-94407 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-94407?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-94407?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-94407 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.

Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.

Badge for a README or a site

CVE-2026-94407

An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:

[![CVE-2026-94407](https://cve.bz/cve/badge/CVE-2026-94407.svg)](https://cve.bz/cve/CVE-2026-94407)

HTML:

<a href="https://cve.bz/cve/CVE-2026-94407"><img src="https://cve.bz/cve/badge/CVE-2026-94407.svg" alt="CVE-2026-94407"></a>

Affected

  • ibm:contextforge mcp gateway

Versions

From the CNA's record in the CVE List.

ProductAffected
IBM ContextForge MCP Gatewayfrom 1.0.0 through 1.0.11

Attack patterns (CAPEC)

  • CAPEC-492 Regular Expression Exponential Blowup

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

Check your stackJSON