Vulnerability · Published Sep 18, 2026 · Assigned by ibm
CVE-2026-10858IBM MQ for HPE NonStop is vulnerable to a denial of service attack
Critical 9.9
In plain English
A critical-severity heap buffer overflow in MQ for HPE NonStop from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)0.6%top 51.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40 could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to a heap buffer underflow when processing multi-segment messages.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| IBM | MQ for HPE NonStop | 8.1.0 – through 8.1.0.40 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://www.ibm.com/support/pages/node/7287704 vendor-advisory, patch