Quick answers
- Is CVE-2026-10858 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-10858 being exploited in the wild.
- How severe is CVE-2026-10858?
- Critical severity, with a CVSS score of 9.9, published 18 September 2026.
- Which products and versions are affected?
- IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40.
- Is there a fix for CVE-2026-10858?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-10858 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-10858?
- Check whether you run IBM MQ for HPE NonStop 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.
Technical details
A heap buffer underflow vulnerability (CWE-122) exists in the message processing logic when handling multi-segment messages. The vulnerability requires authentication and network access but has no user interaction requirement. Successful exploitation allows an authenticated attacker to either crash the MQ service (DoS) or achieve arbitrary code execution with the privileges of the MQ process.
Affected products
- IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40
Timeline
- 2026-09-18: disclosed