CVE-2026-8834

Authenticated code execution via undisclosed heap overflow

Published May 26, 2026 · Updated May 26, 2026

Heap-based buffer overflow in IBM HTTP Server 8.5 and 9.0 allows remote authenticated users to execute code or crash the server. IBM has not disclosed the affected Administration Server component, buffer, or input-processing operation that overruns heap memory. Exploitation requires a privileged Administration Server account and adjacent network access; successful attacks execute code or terminate the server process.

CVSS severity8.0
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in IBM HTTP Server 8.5 and 9.0 allows remote authenticated users to execute code or crash the server. IBM has not disclosed the affected Administration Server component, buffer, or input-processing operation that overruns heap memory. Exploitation requires a privileged Administration Server account and adjacent network access; successful attacks execute code or terminate the server process.

The record

CVE
CVE-2026-8834
Published
May 26, 2026
Updated
May 26, 2026
Vendor
OpenBMC Project
Product
IBM HTTP Server
Classifications
CWE-122, T1210
Attack vector
adjacent
Privileges
admin

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?

Compare these published version ranges with your installed build and any vendor patches.

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

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

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

Published CVSS scores

8.0IBMCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/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.

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No observations available

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

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

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Your stack

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