CVE-2026-8856

Service interruption via crafted SSL configuration

Published May 26, 2026 · Updated May 26, 2026

Uncontrolled resource consumption in IBM HTTP Server 8.5 and 9.0 allows local users to interrupt service through writable configuration. IBM identifies the affected locus as mod_ibm_ssl handling of SSLStashFile with either SSLPKCSDriver or a non-URI SSLCRLHostname, but it has not disclosed the resource-consuming operation. Exploitation requires write access to server configuration and the uncommon directive combination, and can stop the HTTP service.

CVSS severity7.7
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in IBM HTTP Server 8.5 and 9.0 allows local users to interrupt service through writable configuration. IBM identifies the affected locus as mod_ibm_ssl handling of SSLStashFile with either SSLPKCSDriver or a non-URI SSLCRLHostname, but it has not disclosed the resource-consuming operation. Exploitation requires write access to server configuration and the uncommon directive combination, and can stop the HTTP service.

The record

CVE
CVE-2026-8856
Published
May 26, 2026
Updated
May 26, 2026
Vendor
OpenBMC Project
Product
IBM HTTP Server
Classifications
CWE-400, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=8.5.0 <=Interim Fix 002
  2. Affected versionversion=9.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

OpenBMC Project · IBM HTTP Serverversion=8.5.0 <=Interim Fix 002; version=9.0

Published CVSS scores

9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
7.7IBMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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