CVE-2023-26285Network attack vector

Service interruption via malformed client data

Published May 5, 2023 · Updated Jan 29, 2025

Denial of service in the IBM MQ Server component in IBM MQ 9.2 CD, 9.2 LTS, 9.3 CD, and 9.3 LTS allows remote attackers to interrupt service. The server mishandles invalid data received from a compromised client, but IBM has not disclosed the responsible parser or faulty operation. Network access to the MQ Server and crafted client data are required; the documented consequence is interruption of the MQ service.

CVSS severity5.9
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in the IBM MQ Server component in IBM MQ 9.2 CD, 9.2 LTS, 9.3 CD, and 9.3 LTS allows remote attackers to interrupt service. The server mishandles invalid data received from a compromised client, but IBM has not disclosed the responsible parser or faulty operation. Network access to the MQ Server and crafted client data are required; the documented consequence is interruption of the MQ service.

The record

CVE
CVE-2023-26285
Published
May 5, 2023
Updated
Jan 29, 2025
Vendor
IBM
Product
IBM MQ
Classifications
CWE-770, CWE-119, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=9.2 CD, 9.2 LTS, 9.3 CD, 9.3 LTS

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM MQversion=9.2 CD, 9.2 LTS, 9.3 CD, 9.3 LTS

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9IBM CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo