Medium severity · published Jun 30, 2026
CVE-2026-9002
IBM WebSphere eXtremes Scale is affected by uncontrolled resource consumption when XDF is enabled
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
WebSphere Extreme Scale · IBM
8.6.1.0 through 8.6.1.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9002
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9002
Vendor Advisory
https://www.ibm.com/support/pages/node/7278346
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