CVE-2026-8852

Local denial of service via mod_fastcgi assertion

Published May 26, 2026 · Updated May 26, 2026

Reachable assertion in IBM HTTP Server 8.5 and 9.0 allows local users to interrupt service through the optional mod_fastcgi module. IBM identifies the locus as mod_fastcgi and classifies the flaw as CWE-617, but has not disclosed the assertion condition or input that reaches it. The module must be loaded, a rare optional configuration; exploitation is local and affects availability without reported data exposure or modification.

CVSS severity6.2
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reachable assertion in IBM HTTP Server 8.5 and 9.0 allows local users to interrupt service through the optional mod_fastcgi module. IBM identifies the locus as mod_fastcgi and classifies the flaw as CWE-617, but has not disclosed the assertion condition or input that reaches it. The module must be loaded, a rare optional configuration; exploitation is local and affects availability without reported data exposure or modification.

The record

CVE
CVE-2026-8852
Published
May 26, 2026
Updated
May 26, 2026
Vendor
OpenBMC Project
Product
IBM HTTP Server
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectorlocal
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.2IBMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo