CVE-2026-9170 - IBM HTTP Server is affected by multiple vulnerabilities

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CRITICAL

IBM HTTP Server is affected by multiple vulnerabilities

Published May 26, 2026

9.8

CRITICAL

CVSS 3.1

EPSS 0.86%

Description

IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service and a potential remote code execution due to improper input validation.

Affected products

Vendor IBM Product n/a Default
unaffected
- 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

n/a

unaffected

Version	Status	Constraints
8.5	affected	-
9.0	affected	-

Remediation

Vendor solution

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71265.

For IBM HTTP Server used by IBM WebSphere Application Server:

For V9.0.0.0 through 9.0.5.28: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71265 https://www.ibm.com/support/pages/node/7239806 --OR-- · Apply Fix Pack 9.0.5.29 or later (targeted availability 3Q2026).

For V8.5.0.0 through 8.5.5.29: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71265 https://www.ibm.com/support/pages/node/7239806 --OR-- · Apply Fix Pack 8.5.5.30 or later (targeted availability 3Q2026).

Additional interim fixes may be available and linked off the interim fix download page.

Important Note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.

Weaknesses (1)

CWE-94

Code Injection