IBM MQ .NET client is vulnerable to XML external entity injection (CVE-2026-12667) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-12667

IBM MQ .NET client is vulnerable to XML external entity injection

Answer in brief

CVE-2026-12667 records a Unknown severity vulnerability in IBM MQ .NET client is vulnerable to XML external entity injection. The current sources do not mark it as known exploited. The current feed maps IBM/MQ (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/MQ (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
IBM/MQgeneric	9.1.0.0 \|\| 9.2.0.0 \|\| 9.3.0.0 \|\| 9.3.0.0 \|\| 9.4.0.0 \|\| 9.4.0.0 \|\| 10.0.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for IBM/MQ.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Source referenceibm.com

Upstream source description

IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 could allow an authenticated attacker to read files from a vulnerable .NET client or cause limited denial of service due to improper handling of XML external entities in RFH2 folder parsing.

Quoted source text, attributed separately from HOL analysis.