Quick answers
- Is CVE-2026-18142 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18142 being exploited in the wild.
- How severe is CVE-2026-18142?
- High severity, with a CVSS score of 7.1, published 4 November 2026.
- Which products and versions are affected?
- IBM Mq 9.2.0.0–9.2.0.44 LTS, 9.3.0.0–9.3.0.42 LTS, 9.4.0.0–9.4.0.26 LTS, 9.4.0.0–9.4.5.1 CD, 10.0.0.0–10.0.0.5 LTS and CD.
- Is there a fix for CVE-2026-18142?
- Yes: fixed in IBM MQ 9.2.0.46, 9.3.0.43, 9.4.0.30, 10.0.0.6, 10.0.1.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-18142 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-18142?
- Check whether you run IBM Mq at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: IBM MQ 9.2.0.46, 9.3.0.43, 9.4.0.30, 10.0.0.6, 10.0.1.0
Technical details
An integer overflow (CWE-190) in IBM MQ's MQINQ request handler allows a remote authenticated attacker to trigger a denial of service or limited memory corruption. The vulnerability requires network access and prior authentication. Exploitation occurs via a specially crafted malformed MQINQ request that triggers the integer overflow condition.
Affected products
- IBM MQ 9.2.0.0–9.2.0.44 LTS, 9.3.0.0–9.3.0.42 LTS, 9.4.0.0–9.4.0.26 LTS, 9.4.0.0–9.4.5.1 CD, 10.0.0.0–10.0.0.5 LTS and CD
Timeline
- 2026-10-29: disclosed