CVE-2026-18905Network attack vector

Internal data disclosure via DNS rebinding

Published Sep 4, 2026 · Updated Sep 4, 2026

SSRF in IBM ContextForge MCP Gateway 1.0.6 and earlier allows remote authenticated users to read internal resources via DNS rebinding. The url_to_markdown_server validates a hostname before use, but the outbound client resolves it again without pinning the approved IP address. A caller with tool-invocation access and control of DNS can replace a public answer with an internal address, exposing response data reachable from the gateway host.

CVSS severity7.7
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in IBM ContextForge MCP Gateway 1.0.6 and earlier allows remote authenticated users to read internal resources via DNS rebinding. The url_to_markdown_server validates a hostname before use, but the outbound client resolves it again without pinning the approved IP address. A caller with tool-invocation access and control of DNS can replace a public answer with an internal address, exposing response data reachable from the gateway host.

The record

CVE
CVE-2026-18905
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
IBM
Product
ContextForge MCP Gateway
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= v1.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · ContextForge MCP Gatewayversion=<= v1.0.6

Published CVSS scores

7.7IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Unsecured Credentials: Cloud Instance Metadata API

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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