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CVE-2026-94407

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

Products / packages IBM ContextForge MCP Gateway

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:25:33 UTC
ibm · CVSS:3.1 · 6.5
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Severity

medium6.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

IBM ContextForge MCP Gateway versions 1.0.0 through 1.0.11 are potentially vulnerable to denial of service due to uncontrolled regular expression complexity. An authenticated user with tool-registration privileges can embed malicious regex patterns, potentially degrading gateway availability.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

IBM · ibm

ContextForge MCP Gateway

1 range
ibm version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

1.0.0 → through 1.0.11

semver versions

unaffected

unknown

Other versions: unknown

Product identifiers (CPE)cpe:2.3:a:ibm:contextforge_mcp_gateway:1.0.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:contextforge_mcp_gateway:1.0.11:*:*:*:*:*:*:*
Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

IBM strongly recommends addressing the vulnerability now.

Product(s)Version(s) number and/or range Remediation/Fix/InstructionsIBM ContextForge MCP Gateway

v1.0.0 - v1.0.11Upgrade to v1.1.0. See [ v1.1.0 release notes https://github.com/IBM/mcp-context-forge/releases/tag/v1.1.0 ]

ibm guidance ↗

None. IBM strongly recommends upgrading to the fixed version.

ibm guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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.

References

1 sources
www.ibm.com/support/pages/node/7296667
Vendor advisoryibm

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-94407

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-1333 ↗

CWE-1333 Inefficient Regular Expression Complexity

ibm

Related →
Contributing organizations · 1
ibm

Assigning organization

2026-11-13

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.