IBM HTTP Server is affected by multiple vulnerabilities
Summary
| CVE | CVE-2026-8856 |
|---|---|
| State | PUBLISHED |
| Assigner | ibm |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-26 18:16:57 UTC |
| Updated | 2026-05-26 20:22:17 UTC |
| Description | IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service in configurations where an attacker has write access to parts of the server configuration. |
Risk And Classification
Primary CVSS: v3.1 9.1 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS: 0.000310000 probability, percentile 0.093430000 (date 2026-05-27)
Problem Types: CWE-400 | CWE-400 CWE-400 Uncontrolled Resource Consumption
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| 3.1 | [email protected] | Secondary | 7.7 | HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| 3.1 | CNA | CVSS | 7.7 | HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Ibm | Http Server | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | IBM | HTTP Server | affected 8.5.0 Interim Fix 002 semver | Not specified |
| CNA | IBM | HTTP Server | affected 9.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.ibm.com/support/pages/node/7274065 | [email protected] | www.ibm.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Solutions
CNA: 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--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--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 NoteIBM 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.