Vulnerability · Published Jun 30, 2026 · Assigned by ibm

CVE-2026-9002IBM WebSphere eXtremes Scale is affected by uncontrolled resource consumption when XDF is enabled

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in WebSphere Extreme Scale from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 80.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 could allow an adjacent attacker to cause a denial of service due to improper validation in the XDF decoder. The application processes deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds checking, which may allow an attacker on the same network to trigger a StackOverflowError or OutOfMemoryError, resulting in a crash of the WebSphere Application Server JVM.

Affected products (as reported)

Vendor	Product	Versions
IBM	WebSphere Extreme Scale	8.6.1.0 – through 8.6.1.6

Weakness: CWE-400 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://www.ibm.com/support/pages/node/7278346 vendor-advisory, patch