CVE-2026-9336 - IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities

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HIGH

IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities

Published Sep 10, 2026

7.5

HIGH

CVSS 3.1

EPSS 0.77%

Description

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to a denial of service, caused by sending a specially-crafted HTTP request to an administrative endpoint. A remote attacker could exploit this vulnerability to cause the server to exhaust filesystem space.

Affected products

Vendor IBM Product WebSphere Application Server Default
n/a
- Version
  8.5
  Status
  affected
  Constraints
  -
- Version
  9.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

IBM

WebSphere Application Server

n/a

Version	Status	Constraints
8.5	affected	-
9.0	affected	-

Remediation

Vendor solution

IBM strongly recommends addressing the vulnerabilities now by applying the fix pack(s) listed below.

For IBM WebSphere Application Server traditional:

For V9.0.0.0 through 9.0.5.28: · Apply Fix Pack 9.0.5.29 SB0030823 (availability September 2026) or later fix pack.

For V8.5.0.0 through 8.5.5.30: · Apply Fix Pack 8.5.5.31 https://www.ibm.com/support/pages/node/7285869 (availability September 2026) or later fix pack.

Weaknesses (1)

CWE-306

Missing Authentication